How to Download and Install Windows in 2026: The Complete Guide

Installing Windows isn't difficult, but there are several places where a small mistake can cause a big problem.

You might download the wrong architecture, create the USB with the wrong partition layout, erase the wrong drive, install Windows without backing up your files, or discover halfway through setup that your PC is missing a network driver.

The good news is that most of this is easy to avoid.

This guide explains how to download genuine Windows installation media from Microsoft, verify the ISO, create a bootable USB, and install Windows on a PC. It also covers what changes when you're working from Windows, macOS, Linux, an ARM-based computer, or a virtual machine.

Important: Always download Windows from Microsoft or another source you can independently verify as an official Microsoft distribution. Avoid modified "pre-activated", "lite", "debloated", or unofficial Windows ISOs.

Quick Answer: What's the Best Way to Install Windows?

For most people:

Upgrading your current Windows PC: use Windows Update or the Windows 11 Installation Assistant.
Creating a USB for another PC: use Microsoft's Media Creation Tool when supported.
Want an ISO file: download the official Windows ISO directly from Microsoft.
Creating USB media from Windows: Rufus is a convenient option.
Creating a multi-boot USB: Ventoy is useful.
Using Linux: WoeUSB-ng, Ventoy, or another compatible imaging method can be useful.
Using an Intel Mac: Boot Camp can install Windows 10 on supported Intel Macs.
Using an Apple Silicon Mac: use an appropriate virtualization solution for Windows on Arm rather than Boot Camp.

For a normal modern x64 PC, the simplest reliable workflow is:

Microsoft ISO → verify ISO → create bootable USB → boot from USB → install Windows.

Windows 11 in 2026: 25H2 vs 26H1

One important detail has changed since many older Windows installation guides were written.

In 2026, Microsoft has both Windows 11 version 25H2 and Windows 11 version 26H1 in its release information.

However, they are not interchangeable in terms of how you should think about installing them.

Windows 11 25H2

Windows 11 25H2 is the general-purpose release relevant to existing compatible PCs. Microsoft lists it as a General Availability Channel release for Home, Pro, Pro Education, and Pro for Workstations, with updates continuing through October 12, 2027.

Windows 11 26H1

Windows 11 26H1 is different.

Microsoft describes 26H1 as a hardware-optimized release designed for select new devices with newer silicon. It became available on new devices beginning in early 2026.

Existing Windows 11 devices running earlier versions aren't offered 26H1 through Windows Update, and Microsoft says 26H1 cannot be installed as an in-place update on those existing devices.

So don't interpret "26H1 is newer" as "everyone should manually install 26H1."

For most people building or reinstalling an existing x64 PC, the normal Windows 11 download workflow remains the appropriate choice.

Step 1: Download Windows From Microsoft

The safest starting point is Microsoft's official Windows download pages.

If you're downloading an ISO, start from Microsoft's download page and generate the download link there rather than relying on an old direct ISO URL.

Microsoft-generated ISO download links can expire, so don't treat a previously generated direct link as a permanent download address.

Which Windows Download Method Should You Use?

Microsoft provides several ways to obtain Windows installation media.

Method	Best for	USB required?	Difficulty
Windows Update	Updating an existing PC	No	Easy
Installation Assistant	Upgrading a compatible PC	No	Easy
Media Creation Tool	Creating Windows installation media	Optional	Easy
Direct ISO	VMs, clean installs, advanced users	Optional	Medium
Windows ARM64 ISO	ARM-based devices and VMs	Optional	Medium
Insider ISO	Testing preview builds	Optional	Advanced

The important distinction is that an ISO is not the same thing as a bootable USB.

An ISO is the Windows installation image. You still need to put that image onto suitable installation media or mount it in a virtual machine.

Option 1: Windows Installation Assistant

If you're already running Windows and simply want to upgrade the same computer, the Installation Assistant can be easier than creating a USB.

This is useful when:

You want to upgrade your current PC.
You don't need to erase the drive.
You don't need installation media for another computer.
Your hardware is compatible with the target Windows release.

For a clean installation, however, use installation media instead.

Option 2: Media Creation Tool

The Media Creation Tool is designed to make Windows installation media.

The general workflow is:

Open Microsoft's Windows 11 download page.
Find the installation media section.
Download the Media Creation Tool.
Run it as administrator if required.
Accept the license terms.
Choose to create installation media.
Select the language and edition.
Choose a USB flash drive or ISO file.
Let the tool download and prepare the media.

Microsoft recommends using a blank USB drive because its contents will be erased.

An 8 GB or larger USB drive is the minimum Microsoft specifies for Windows installation media on its relevant download pages. A larger USB drive is fine.

Option 3: Download the Windows ISO Directly

The direct ISO method is useful when you want more control.

An ISO is useful for:

Clean installations
Virtual machines
Repair installations
Testing
Creating USB media with another tool
Keeping installation media for later

The important thing to understand is that the ISO is a disk image, not Windows source code.

It contains the files and boot information required for Windows installation.

Typical ISO workflow

Open Microsoft's Windows download page.
Select the Windows ISO.
Select the language.
Download the appropriate architecture.
Wait for the download to finish.
Verify the ISO.
Create bootable installation media if needed.

Microsoft provides a verification process for Windows ISO downloads using SHA-256 hashes.

x64 or ARM64: Which ISO Do You Need?

This is one of the easiest mistakes to make.

Most traditional Intel and AMD PCs use x64 Windows.

Some newer devices use ARM64, including many Snapdragon-based Windows PCs.

x64

Choose x64 if your computer uses a compatible Intel or AMD 64-bit processor.

ARM64

Choose ARM64 if your computer uses an ARM-based processor and is intended to run Windows on Arm.

Microsoft provides a separate Windows 11 ARM64 ISO download. Microsoft also notes that the Media Creation Tool does not currently create ARM64 bootable media, so ARM devices may require another supported method.

How to check your architecture

On Windows:

Settings → System → About → System type

You can also open System Information and check the processor/system type.

Don't assume that an ARM-based laptop should use the normal x64 ISO.

Windows 11 ARM64 Installation

Windows on Arm deserves a little extra attention.

Microsoft says the Windows 11 ARM64 ISO can be used for:

ARM virtual machines
Installing Windows on Arm
Creating bootable installation media

However, some ARM devices may require drivers from the device manufacturer for the installation media to boot or for all hardware to work correctly.

This is particularly important with older Snapdragon-based Windows devices.

For some newer Snapdragon X Series systems, Windows installation media can boot without additional drivers, but Microsoft still recommends installing the remaining device drivers afterward.

So before reinstalling Windows on an ARM laptop:

Check the manufacturer's recovery options.
Download important drivers if available.
Keep another computer or network connection available in case Windows needs additional drivers.

Should You Verify the Windows ISO?

Yes.

This is one of the easiest security checks you can perform.

A SHA-256 hash is effectively a fingerprint for a file. If the calculated hash matches Microsoft's published hash for that exact ISO, it provides strong evidence that the file you downloaded matches Microsoft's published image.

Microsoft documents ISO verification using SHA-256 and PowerShell.

Verify on Windows

Open PowerShell and run:

Get-FileHash "C:\Users\YourName\Downloads\Windows.iso" -Algorithm SHA256

You'll get output similar to:

Algorithm       Hash
---------       ----
SHA256          ABC123...

Compare the hash with the value Microsoft publishes for the exact ISO.

Verify on macOS

Open Terminal:

shasum -a 256 ~/Downloads/Windows.iso

Verify on Linux

Run:

sha256sum ~/Downloads/Windows.iso

What if the hash doesn't match?

Don't install the ISO.

First check that:

You downloaded the exact same edition/language/architecture.
You're comparing against the correct Microsoft hash.
The download completed successfully.

If everything is correct and the hash still doesn't match, download the ISO again from Microsoft.

A Note About Direct Microsoft Download Links

You may notice that Microsoft's ISO download URLs look complicated and aren't permanent.

That's normal.

Microsoft generates download links for selected ISO downloads, and those links can expire. Microsoft Q&A examples also document the generated links as being valid for a limited period.

The important rule is:

Bookmark Microsoft's download page, not a generated ISO URL.

That way you always start from the official source and generate a fresh download link when necessary.

Windows 10 in 2026: Should You Still Install It?

Windows 10 is still downloadable from Microsoft, but there's an important catch.

Windows 10 reached its normal end of support on October 14, 2025. Microsoft no longer provides normal free security updates, technical support, or feature updates to standard Windows 10 installations.

The final major release is Windows 10 version 22H2.

Microsoft currently offers a Consumer Extended Security Updates program for eligible Windows 10 22H2 devices.

Windows 10 Extended Security Updates

Eligible consumer Windows 10 22H2 systems can enroll in Microsoft's ESU program.

ESU provides important and critical security updates, but it does not restore normal feature development or technical support.

Microsoft says consumer ESU updates are available through October 13, 2026.

Eligibility and enrollment options can vary by region.

So if you're installing Windows on a new computer in 2026, Windows 11 is generally the better choice if the hardware supports it.

Windows 10 still makes sense in situations such as:

Legacy hardware
Older software compatibility
Specialized equipment
Applications that specifically require Windows 10
Hardware that doesn't meet Windows 11 requirements

What About Windows 7 and Windows 8.1?

Windows 7 and Windows 8.1 are long out of support.

For a modern everyday computer, installing them is generally a poor choice because they no longer receive normal security updates.

If you need an old Windows version for legitimate legacy software or hardware, use the original recovery media or properly licensed installation media where available.

For an old general-purpose computer, another option is a supported lightweight Linux distribution.

Creating a Bootable Windows USB

Once you have your ISO, you need to create installation media.

There are several ways to do this.

Method 1: Microsoft's Media Creation Tool

If you're using Windows and don't need the ISO separately, this is usually the simplest option.

The tool can create the installation USB for you.

The basic process is:

Insert a blank USB drive.
Open Microsoft's Media Creation Tool.
Choose the option to create installation media.
Select your language and edition.
Choose USB flash drive.
Select the correct USB drive.
Let Microsoft download and prepare the media.
Safely eject the USB when finished.

Warning: The selected USB drive will be erased.

Method 2: Rufus

Rufus official website

Rufus is a popular Windows utility for creating bootable USB drives.

It is especially useful when you already have an ISO and want control over how the USB is prepared.

Typical workflow:

Insert your USB drive.
Open Rufus.
Select the correct USB device.
Select your Windows ISO.
Choose the appropriate partition scheme.
Review the settings carefully.
Start the process.
Confirm that the USB can be erased.
Wait for the operation to finish.

GPT or MBR?

For a modern PC using UEFI, GPT is normally the right choice.

GPT	MBR
Modern partitioning system	Legacy partitioning system
Designed for UEFI systems	Common with legacy BIOS
Supports very large disks	Traditional 2 TB limitation
Recommended for modern Windows PCs	Mainly useful for legacy hardware

A useful rule is:

Modern UEFI PC → GPT

Legacy BIOS PC → MBR

Don't choose based purely on the age of the computer. Check whether the target system boots using UEFI or legacy BIOS.

Windows 11, UEFI, Secure Boot and TPM

Windows 11's official hardware requirements include:

Compatible 64-bit processor
At least 4 GB RAM
At least 64 GB storage
UEFI firmware
Secure Boot capability
TPM 2.0
Compatible graphics hardware
Appropriate display requirements

Microsoft documents these requirements in its Windows 11 specifications.

One subtle but important point:

Secure Boot capability is part of the requirement.

That doesn't mean every troubleshooting situation should involve permanently disabling Secure Boot.

For a normal Windows 11 installation, leave Secure Boot enabled unless you have a specific compatibility reason to change it.

What About Unsupported Windows 11 Hardware?

You may see tools that offer options for bypassing Windows 11 hardware checks.

Those options exist, but they aren't equivalent to meeting Microsoft's requirements.

Installing Windows 11 on unsupported hardware can lead to compatibility problems and changes in Microsoft's support/update expectations.

For a normal production computer, the safest approach is to use hardware that meets Microsoft's requirements.

If you're experimenting with an old PC, understand the limitations before proceeding.

Method 3: Ventoy

Ventoy official website

Ventoy is particularly useful if you regularly install operating systems.

Instead of recreating the USB every time you want to use another ISO, you install Ventoy to the USB once and then copy ISO files onto it.

For example, one USB could contain:

Windows11.iso
Windows10.iso
Ubuntu.iso
Fedora.iso
Rescue.iso

When you boot from the USB, Ventoy displays a menu from which you can select the ISO.

Ventoy supports Windows ISOs and provides a WIMBOOT mode for some situations where the normal Windows ISO boot method doesn't work.

Secure Boot note

Ventoy has Secure Boot support, but its behavior and key-enrollment requirements can vary by firmware and Ventoy version.

If you're using Ventoy on a machine with Secure Boot enabled, follow Ventoy's current Secure Boot instructions rather than blindly disabling security features.

Method 4: balenaEtcher

balenaEtcher official website

Etcher is a simple graphical imaging utility available across major desktop platforms.

The basic workflow is:

Select the ISO.
Select the USB drive.
Start the flash operation.
Wait for verification/completion.
Eject the USB.

However, Windows installation media has some platform-specific details, particularly around FAT32 and large WIM files.

For Windows specifically, Microsoft's own tools or a Windows-aware tool such as Rufus may be a better choice when you want the fewest compatibility surprises.

The 4 GB FAT32 Problem

This is one of the most commonly misunderstood parts of Windows USB creation.

FAT32 has a maximum individual file size of approximately 4 GB.

Some Windows installation images contain a sources\install.wim larger than that.

Microsoft documents splitting the WIM into smaller .swm files when necessary.

For example:

sources\install.swm
sources\install2.swm
sources\install3.swm

Windows Setup can use these split image files.

This is one reason tools designed specifically for Windows installation media are convenient: they can handle the filesystem and WIM-size problem for you.

Creating Windows USB on macOS

If you're using a Mac, the process depends heavily on the type of Mac.

There are two major categories:

Intel Mac
Apple Silicon Mac

Intel Mac

Apple's Boot Camp technology supports Windows installation on supported Intel-based Macs.

Apple's current documentation specifically covers installing Windows 10 using Boot Camp on supported Intel Macs.

Boot Camp is not available on Apple Silicon Macs in the same way.

If you have an Intel Mac and want Windows alongside macOS, check Apple's documentation for your exact Mac model before proceeding.

Apple Silicon Mac

Apple Silicon Macs use ARM-based processors.

That means you should think in terms of Windows on Arm, not the traditional x64 Windows installation used by most Intel/AMD PCs.

Microsoft provides a Windows 11 ARM64 ISO specifically for ARM-based PCs and virtual machines.

For an Apple Silicon Mac, virtualization is generally the more appropriate route.

Depending on your requirements, you can use a compatible virtualization application and install Windows 11 Arm64 as a virtual machine.

Creating Windows USB on Linux

Linux gives you several options.

You can use:

Ventoy
WoeUSB-ng
A compatible graphical disk imaging utility
Manual Windows media preparation

WoeUSB-ng

WoeUSB-ng is designed specifically for creating Windows installation USB drives from Linux.

A typical command looks like:

sudo woeusb --device /path/to/windows.iso /dev/sdX

Be extremely careful with /dev/sdX.

The destination should be the USB device, not your Linux system drive.

Before running a destructive command, identify the USB carefully.

Using `lsblk`

Run:

lsblk

You'll see disks and partitions.

Example:

NAME        SIZE TYPE
nvme0n1     512G disk
├─nvme0n1p1 512M part
└─nvme0n1p2 511G part
sdb          32G disk
└─sdb1       32G part

In this example, sdb may be the USB drive.

But don't blindly assume.

A safer method is:

Run lsblk.
Unplug the USB.
Run lsblk again.
Plug the USB back in.
Run lsblk again.
Identify the newly appearing device.

Then double-check the size and device name.

Linux `dd`: Powerful but Dangerous

You can write an image using dd, but it should be treated as a destructive command.

Example:

sudo dd if=/path/to/windows.iso of=/dev/sdX bs=4M status=progress

Then flush pending writes:

sync

Finally, safely eject the USB:

sudo eject /dev/sdX

Replace /dev/sdX with the actual USB device.

Do not copy this command blindly.

If you accidentally use your internal drive as the of= destination, you can overwrite it.

macOS `dd`

The same principle applies on macOS, but device names are different.

First:

diskutil list

Identify the external USB disk.

Then unmount it:

diskutil unmountDisk /dev/diskN

where diskN is your USB device.

You can then use a block-level imaging command if the Windows media you're creating is compatible with the target firmware and tool.

For Windows installation media on Macs, however, a dedicated tool or the manufacturer's recommended method is often preferable to assuming that a raw dd write will work on every Mac.

Important: Don't Assume Every Windows ISO Works With `dd`

This is a correction worth making to many older Windows guides.

A raw ISO-to-USB write isn't universally equivalent to creating Windows installation media.

Windows media has considerations involving:

UEFI boot
FAT32
NTFS
install.wim
4 GB file-size limits
Firmware compatibility
USB partition layout

So while dd is extremely useful for many disk images, Rufus, Ventoy, Microsoft's Media Creation Tool, or WoeUSB-ng can be more appropriate for Windows installation media depending on your platform.

Booting the PC From the USB

Once your USB is ready:

Shut down the target PC.
Insert the USB.
Turn the PC on.
Open the boot menu.
Select the USB drive.
Windows Setup should load.

Common boot-menu keys include:

Manufacturer	Common boot key
Dell	F12
HP	Esc or F9
Lenovo	F12
Acer	F12
ASUS	F8 or Esc
MSI	F11
Gigabyte	F12
ASRock	F11
Microsoft Surface	Volume Down + Power

These keys can vary by model, so check the manufacturer's documentation if the listed key doesn't work.

You may see something like:

UEFI: SanDisk USB
SanDisk USB
Windows Boot Manager

On a modern UEFI system, choose the entry beginning with:

UEFI:

when available.

This helps ensure you're booting the installer in UEFI mode rather than legacy BIOS compatibility mode.

Before Installing Windows

Don't start deleting partitions until you've checked these things.

Backup your files

A clean installation can erase the Windows installation and its partitions.

Back up:

Documents
Photos
Videos
Projects
Browser data
Game saves
SSH keys
Important configuration files
School/work files
Any data stored outside your normal cloud backup

If the data matters, keep another copy.

Confirm your Windows edition

If your PC previously had Windows Home and you install a different edition, activation may not happen automatically.

Common editions include:

Windows 11 Home
Windows 11 Pro
Windows 11 Enterprise

A digital license can often reactivate Windows automatically on the same hardware, but edition and licensing details matter.

Check Windows 11 compatibility

Microsoft's minimum requirements include:

Compatible CPU
4 GB RAM
64 GB storage
UEFI
Secure Boot capability
TPM 2.0

For a supported installation, check Microsoft's current compatibility information before wiping the machine.

Download important drivers

This is especially useful for:

Custom-built desktops
Older laptops
Unusual Wi-Fi adapters
Ethernet adapters
ARM-based computers

If Windows Setup doesn't have your Wi-Fi driver, you may end up with no internet immediately after installation.

Download important drivers beforehand if the manufacturer provides them.

Installing Windows From USB

When Windows Setup starts:

Select your language.
Select your time and currency format.
Select your keyboard layout.
Click Install now.
Enter your product key if requested.
Select the appropriate Windows edition if prompted.
Accept the license terms.
Choose the installation type.

For a completely clean installation, choose:

Custom: Install Windows only

You will then see the disk and partition selection screen.

Be Careful With the Partition Screen

This is where you can permanently delete data.

You might see partitions such as:

Drive 0 Partition 1
Drive 0 Partition 2
Drive 0 Partition 3
Drive 0 Partition 4

Do not delete partitions just because their names look unfamiliar.

Recovery partitions, EFI partitions, manufacturer partitions, and data partitions may contain important information.

If you're intentionally wiping the entire target drive and have already backed up everything, you can delete the partitions belonging to that drive and allow Windows Setup to create the required partitions.

If the PC contains multiple drives, be especially careful.

"Windows Cannot Be Installed to This Disk"

Two common errors involve GPT and MBR.

Error: Disk has GPT partition style

This often means you're booting the installer in Legacy BIOS mode while the disk is configured for GPT.

The preferred solution on a modern system is usually:

Boot the installer in UEFI mode.
Use GPT for the Windows installation disk.

Error: Disk has MBR partition table

This can happen when Windows Setup is booted in UEFI mode but the target disk is still MBR.

For a modern installation, converting the disk to GPT is usually the better approach if you're intentionally wiping the disk.

Warning: Converting a disk as part of a clean installation can destroy existing data.

Do not run destructive disk commands until you have confirmed the correct drive and backed up anything important.

After Windows Finishes Installing

Don't consider the job finished when the desktop appears.

Do these things next:

1. Run Windows Update

Open:

Settings → Windows Update

Install available updates and restart when required.

Repeat until there are no important updates left.

2. Install manufacturer drivers

Check the computer manufacturer's support page for:

Chipset
Graphics
Wi-Fi
Bluetooth
Audio
Touchpad
Camera
Card reader
Power-management components

Windows Update handles many drivers automatically, but manufacturer drivers can still matter.

3. Check Device Manager

Open:

Device Manager

Look for devices with warning icons.

If something is missing, identify the hardware and install the appropriate driver from the manufacturer's official website.

4. Activate Windows

Open:

Settings → System → Activation

Check the activation status.

If you have a valid digital license for the same edition on the same hardware, Windows may reactivate automatically once the computer connects to the internet.

Common Windows Installation Problems

Try:

Another USB port
Another USB drive
Recreating the installation media
Checking UEFI settings
Checking whether USB boot is enabled
Selecting the UEFI USB entry
Updating firmware if appropriate

Some systems also have Fast Boot settings that can make it harder to enter the boot menu.

Problem: Windows Setup can't find the SSD

This can happen on some newer computers because of storage-controller configuration or missing drivers.

Check the computer manufacturer's documentation.

On some systems, changing storage-controller settings may affect existing installations, so don't randomly change BIOS storage settings without understanding what they do.

Problem: No Wi-Fi after installation

This usually means Windows doesn't have the appropriate Wi-Fi driver.

Possible solutions:

Connect temporarily through Ethernet.
Use a USB Ethernet adapter.
Download the Wi-Fi driver on another computer and transfer it using USB.
Install the manufacturer's driver package.

Problem: Windows says TPM 2.0 is missing

Check the UEFI/firmware settings for TPM-related options.

Depending on the hardware, the option may have a manufacturer-specific name.

For example, modern Intel and AMD systems may expose firmware-based TPM functionality through their firmware settings.

Don't disable security features just to make an installation work unless you understand the consequences.

Problem: Secure Boot is disabled

Windows 11 requires UEFI firmware that is Secure Boot capable.

If you're troubleshooting a bootable USB, check whether:

The computer is actually booting in UEFI mode.
The USB was created correctly.
The firmware is detecting the USB correctly.

If a third-party boot tool has its own Secure Boot requirements, follow that tool's current documentation rather than permanently disabling Secure Boot without a reason.

What If the ISO Is Too Large for FAT32?

FAT32 has a maximum individual file size of 4 GB.

If sources\install.wim exceeds that limit, you have several options.

Option 1: Use Rufus

Rufus can prepare Windows installation media and handle common Windows ISO limitations.

Option 2: Use WoeUSB-ng

Linux users can use WoeUSB-ng to create Windows installation media.

Option 3: Split the WIM manually

Microsoft documents using DISM to split a large WIM:

Dism /Split-Image /ImageFile:D:\sources\install.wim /SWMFile:E:\sources\install.swm /FileSize:3800

The resulting .swm files can be placed in the appropriate sources directory. Windows Setup supports split image files.

For most users, however, using a tool that handles this automatically is easier.

Installing Windows in a Virtual Machine

If you don't want to replace your current operating system, you can install Windows inside a virtual machine.

An ISO is particularly useful here.

Common virtualization platforms include:

Hyper-V
VirtualBox
VMware
UTM
Other compatible virtualization software

The exact configuration depends on your host operating system and CPU architecture.

For Windows 11 VMs, configure the virtual machine with the security features Windows 11 expects, such as Secure Boot and virtual TPM where supported.

Microsoft documents Windows 11 VM requirements and configuration considerations.

Installing Windows on an Old PC

If you're trying to revive an older computer, don't immediately assume Windows 11 is the right answer.

First check:

CPU compatibility
TPM 2.0
Secure Boot capability
RAM
Storage
Driver availability

If the hardware doesn't meet Windows 11's requirements, installing an unsupported configuration may create more problems than it solves.

A supported lightweight Linux distribution may be a better option for genuinely old hardware.

Windows Installation Checklist

Before starting:

During installation:

Boot the USB in UEFI mode
Confirm the correct target disk
Don't delete partitions accidentally
Choose the correct Windows edition
Complete Windows Setup

After installation:

Windows Installation Cheat Sheet

Situation	Recommended approach
Upgrade current Windows PC	Windows Update / Installation Assistant
Clean install on modern PC	Official ISO + bootable USB
Create USB from Windows	Media Creation Tool or Rufus
Multi-boot USB	Ventoy
Windows USB from Linux	WoeUSB-ng or Ventoy
Windows on Intel Mac	Check Boot Camp compatibility
Windows on Apple Silicon Mac	Windows on Arm VM
Snapdragon Windows PC	ARM64 Windows media
Old unsupported PC	Consider supported Linux instead
VM installation	Official ISO
Need to verify ISO	SHA-256

Official Resources

Microsoft

USB Creation Tools

Apple

Apple Boot Camp documentation

Frequently Asked Questions

Can I download Windows 11 for free?

Yes. Microsoft provides Windows installation media and ISO downloads without charging for the download itself.

However, using Windows still requires an appropriate license/activation depending on your situation.

Downloading an ISO and having a Windows license are two separate things.

Is it safe to download Windows from third-party ISO websites?

The safest choice is to download Windows directly from Microsoft.

Third-party sources may provide useful archival material in some circumstances, but if you're installing Windows on your everyday computer, there's little reason to introduce unnecessary uncertainty when Microsoft provides official installation media.

Is Windows 11 26H1 the latest Windows?

26H1 is a newer Windows 11 release, but it isn't simply the next upgrade that every existing Windows 11 PC should install.

Microsoft describes 26H1 as a hardware-optimized release for select new devices, and existing devices aren't offered it as an in-place upgrade.

For most existing compatible PCs, 25H2 remains the relevant general-purpose release.

Do I need an ISO to install Windows?

No.

If you're using Microsoft's Media Creation Tool, it can create installation media for you.

An ISO is useful when you want more control, need a VM, or want to create the USB using another tool.

Can I install Windows without a USB?

Yes.

Depending on your situation, you can:

Upgrade an existing Windows installation.
Mount an ISO and run Windows Setup.
Install Windows inside a virtual machine.
Use a manufacturer recovery system.

A USB is mainly useful for a clean installation or when the existing operating system isn't booting.

Can I install Windows 11 on an ARM computer?

Yes, provided the device is supported and compatible.

Microsoft provides a Windows 11 ARM64 ISO. Some devices may require manufacturer-specific drivers during or after installation.

Can I install Windows on an Apple Silicon Mac?

You cannot use Intel-era Boot Camp in the same way on Apple Silicon Macs.

Apple's Boot Camp documentation applies to Intel-based Macs, while Apple Silicon systems use ARM-based processors.

For Apple Silicon, Windows on Arm virtualization is generally the practical approach.

Does copying an ISO to a USB make it bootable?

Usually, no.

Dragging:

Windows.iso

onto a USB simply copies the ISO file.

It doesn't necessarily create the boot structure required by the target firmware.

Use an appropriate media-creation tool or properly prepare the USB.

Can I use an 8 GB USB drive?

Microsoft specifies at least 8 GB for Windows installation media on its download pages.

A larger drive is fine and can be useful if you're using Ventoy or storing multiple ISOs.

Should I use GPT or MBR?

For a modern UEFI computer, GPT is normally the correct choice.

Use MBR mainly when you're dealing with a system that genuinely needs legacy BIOS booting.

Should Secure Boot be disabled?

Normally, no.

Windows 11 is designed around modern UEFI security features.

If a particular USB tool has a Secure Boot compatibility issue, troubleshoot that specific problem rather than automatically disabling Secure Boot permanently.

What happens if I clean install Windows?

A clean installation can remove the existing Windows installation, applications, settings, and data from the selected partitions.

Always back up important data before starting.

Final Thoughts

A Windows installation doesn't need to be complicated.

The safest approach is surprisingly simple:

Get the installation files from Microsoft. Verify them. Use the correct architecture. Create the USB carefully. Boot it in the correct firmware mode. Back up your data before touching partitions.

Most Windows installation disasters aren't caused by Windows Setup itself. They're caused by rushing through the steps before Setup starts.

Take five minutes to identify your hardware, confirm your USB drive, check your backups, and verify your ISO.

That small amount of preparation can save hours of troubleshooting later.

And if you're installing Windows in 2026, remember the most important version distinction: Windows 11 26H1 is a hardware-focused release for select new devices, while 25H2 remains the normal general-purpose release you should expect to work with when installing Windows on an existing compatible PC.

Install from a clean source, keep your drivers ready, run Windows Update after installation, and you'll have a much better starting point.

Last reviewed: August 11, 2026

This guide focuses on official Windows installation media and supported installation methods. Windows versions, download options, hardware requirements, and third-party tools can change over time, so check the linked official documentation before performing a major installation.

How to Download and Install Windows in 2026: The Complete Guide

Installing Windows isn't difficult, but there are several places where a small mistake can cause a big problem.

The good news is that most of this is easy to avoid.

Important: Always download Windows from Microsoft or another source you can independently verify as an official Microsoft distribution. Avoid modified "pre-activated", "lite", "debloated", or unofficial Windows ISOs.

Quick Answer: What's the Best Way to Install Windows?

For most people:

Upgrading your current Windows PC: use Windows Update or the Windows 11 Installation Assistant.
Creating a USB for another PC: use Microsoft's Media Creation Tool when supported.
Want an ISO file: download the official Windows ISO directly from Microsoft.
Creating USB media from Windows: Rufus is a convenient option.
Creating a multi-boot USB: Ventoy is useful.
Using Linux: WoeUSB-ng, Ventoy, or another compatible imaging method can be useful.
Using an Intel Mac: Boot Camp can install Windows 10 on supported Intel Macs.
Using an Apple Silicon Mac: use an appropriate virtualization solution for Windows on Arm rather than Boot Camp.

For a normal modern x64 PC, the simplest reliable workflow is:

Microsoft ISO → verify ISO → create bootable USB → boot from USB → install Windows.

Windows 11 in 2026: 25H2 vs 26H1

One important detail has changed since many older Windows installation guides were written.

In 2026, Microsoft has both Windows 11 version 25H2 and Windows 11 version 26H1 in its release information.

However, they are not interchangeable in terms of how you should think about installing them.

Windows 11 25H2

Windows 11 26H1

Windows 11 26H1 is different.

Microsoft describes 26H1 as a hardware-optimized release designed for select new devices with newer silicon. It became available on new devices beginning in early 2026.

Existing Windows 11 devices running earlier versions aren't offered 26H1 through Windows Update, and Microsoft says 26H1 cannot be installed as an in-place update on those existing devices.

So don't interpret "26H1 is newer" as "everyone should manually install 26H1."

For most people building or reinstalling an existing x64 PC, the normal Windows 11 download workflow remains the appropriate choice.

Step 1: Download Windows From Microsoft

The safest starting point is Microsoft's official Windows download pages.

Official Windows 11 download page

Microsoft Windows 11 download page

Windows 11 ARM64 download page

Microsoft Windows 11 ARM64 download page

Windows 10 download page

Microsoft Windows 10 download page

If you're downloading an ISO, start from Microsoft's download page and generate the download link there rather than relying on an old direct ISO URL.

Microsoft-generated ISO download links can expire, so don't treat a previously generated direct link as a permanent download address.

Which Windows Download Method Should You Use?

Microsoft provides several ways to obtain Windows installation media.

Method	Best for	USB required?	Difficulty
Windows Update	Updating an existing PC	No	Easy
Installation Assistant	Upgrading a compatible PC	No	Easy
Media Creation Tool	Creating Windows installation media	Optional	Easy
Direct ISO	VMs, clean installs, advanced users	Optional	Medium
Windows ARM64 ISO	ARM-based devices and VMs	Optional	Medium
Insider ISO	Testing preview builds	Optional	Advanced

The important distinction is that an ISO is not the same thing as a bootable USB.

An ISO is the Windows installation image. You still need to put that image onto suitable installation media or mount it in a virtual machine.

Option 1: Windows Installation Assistant

If you're already running Windows and simply want to upgrade the same computer, the Installation Assistant can be easier than creating a USB.

This is useful when:

You want to upgrade your current PC.
You don't need to erase the drive.
You don't need installation media for another computer.
Your hardware is compatible with the target Windows release.

For a clean installation, however, use installation media instead.

Option 2: Media Creation Tool

The Media Creation Tool is designed to make Windows installation media.

The general workflow is:

Open Microsoft's Windows 11 download page.
Find the installation media section.
Download the Media Creation Tool.
Run it as administrator if required.
Accept the license terms.
Choose to create installation media.
Select the language and edition.
Choose a USB flash drive or ISO file.
Let the tool download and prepare the media.

Microsoft recommends using a blank USB drive because its contents will be erased.

An 8 GB or larger USB drive is the minimum Microsoft specifies for Windows installation media on its relevant download pages. A larger USB drive is fine.

Option 3: Download the Windows ISO Directly

The direct ISO method is useful when you want more control.

An ISO is useful for:

Clean installations
Virtual machines
Repair installations
Testing
Creating USB media with another tool
Keeping installation media for later

The important thing to understand is that the ISO is a disk image, not Windows source code.

It contains the files and boot information required for Windows installation.

Typical ISO workflow

Open Microsoft's Windows download page.
Select the Windows ISO.
Select the language.
Download the appropriate architecture.
Wait for the download to finish.
Verify the ISO.
Create bootable installation media if needed.

Microsoft provides a verification process for Windows ISO downloads using SHA-256 hashes.

x64 or ARM64: Which ISO Do You Need?

This is one of the easiest mistakes to make.

Most traditional Intel and AMD PCs use x64 Windows.

Some newer devices use ARM64, including many Snapdragon-based Windows PCs.

x64

Choose x64 if your computer uses a compatible Intel or AMD 64-bit processor.

ARM64

Choose ARM64 if your computer uses an ARM-based processor and is intended to run Windows on Arm.

How to check your architecture

On Windows:

Settings → System → About → System type

You can also open System Information and check the processor/system type.

Don't assume that an ARM-based laptop should use the normal x64 ISO.

Windows 11 ARM64 Installation

Windows on Arm deserves a little extra attention.

Microsoft says the Windows 11 ARM64 ISO can be used for:

ARM virtual machines
Installing Windows on Arm
Creating bootable installation media

However, some ARM devices may require drivers from the device manufacturer for the installation media to boot or for all hardware to work correctly.

This is particularly important with older Snapdragon-based Windows devices.

For some newer Snapdragon X Series systems, Windows installation media can boot without additional drivers, but Microsoft still recommends installing the remaining device drivers afterward.

So before reinstalling Windows on an ARM laptop:

Check the manufacturer's recovery options.
Download important drivers if available.
Keep another computer or network connection available in case Windows needs additional drivers.

Should You Verify the Windows ISO?

Yes.

This is one of the easiest security checks you can perform.

Microsoft documents ISO verification using SHA-256 and PowerShell.

Verify on Windows

Open PowerShell and run:

Get-FileHash "C:\Users\YourName\Downloads\Windows.iso" -Algorithm SHA256

You'll get output similar to:

Algorithm       Hash
---------       ----
SHA256          ABC123...

Compare the hash with the value Microsoft publishes for the exact ISO.

Verify on macOS

Open Terminal:

shasum -a 256 ~/Downloads/Windows.iso

Verify on Linux

Run:

sha256sum ~/Downloads/Windows.iso

What if the hash doesn't match?

Don't install the ISO.

First check that:

You downloaded the exact same edition/language/architecture.
You're comparing against the correct Microsoft hash.
The download completed successfully.

If everything is correct and the hash still doesn't match, download the ISO again from Microsoft.

A Note About Direct Microsoft Download Links

You may notice that Microsoft's ISO download URLs look complicated and aren't permanent.

That's normal.

Microsoft generates download links for selected ISO downloads, and those links can expire. Microsoft Q&A examples also document the generated links as being valid for a limited period.

The important rule is:

Bookmark Microsoft's download page, not a generated ISO URL.

That way you always start from the official source and generate a fresh download link when necessary.

Windows 10 in 2026: Should You Still Install It?

Windows 10 is still downloadable from Microsoft, but there's an important catch.

The final major release is Windows 10 version 22H2.

Microsoft currently offers a Consumer Extended Security Updates program for eligible Windows 10 22H2 devices.

Windows 10 Extended Security Updates

Eligible consumer Windows 10 22H2 systems can enroll in Microsoft's ESU program.

ESU provides important and critical security updates, but it does not restore normal feature development or technical support.

Microsoft says consumer ESU updates are available through October 13, 2026.

Eligibility and enrollment options can vary by region.

So if you're installing Windows on a new computer in 2026, Windows 11 is generally the better choice if the hardware supports it.

Windows 10 still makes sense in situations such as:

Legacy hardware
Older software compatibility
Specialized equipment
Applications that specifically require Windows 10
Hardware that doesn't meet Windows 11 requirements

What About Windows 7 and Windows 8.1?

Windows 7 and Windows 8.1 are long out of support.

For a modern everyday computer, installing them is generally a poor choice because they no longer receive normal security updates.

If you need an old Windows version for legitimate legacy software or hardware, use the original recovery media or properly licensed installation media where available.

For an old general-purpose computer, another option is a supported lightweight Linux distribution.

Creating a Bootable Windows USB

Once you have your ISO, you need to create installation media.

There are several ways to do this.

Method 1: Microsoft's Media Creation Tool

If you're using Windows and don't need the ISO separately, this is usually the simplest option.

The tool can create the installation USB for you.

The basic process is:

Insert a blank USB drive.
Open Microsoft's Media Creation Tool.
Choose the option to create installation media.
Select your language and edition.
Choose USB flash drive.
Select the correct USB drive.
Let Microsoft download and prepare the media.
Safely eject the USB when finished.

Warning: The selected USB drive will be erased.

Method 2: Rufus

Rufus official website

Rufus is a popular Windows utility for creating bootable USB drives.

It is especially useful when you already have an ISO and want control over how the USB is prepared.

Typical workflow:

Insert your USB drive.
Open Rufus.
Select the correct USB device.
Select your Windows ISO.
Choose the appropriate partition scheme.
Review the settings carefully.
Start the process.
Confirm that the USB can be erased.
Wait for the operation to finish.

GPT or MBR?

For a modern PC using UEFI, GPT is normally the right choice.

GPT	MBR
Modern partitioning system	Legacy partitioning system
Designed for UEFI systems	Common with legacy BIOS
Supports very large disks	Traditional 2 TB limitation
Recommended for modern Windows PCs	Mainly useful for legacy hardware

A useful rule is:

Modern UEFI PC → GPT

Legacy BIOS PC → MBR

Don't choose based purely on the age of the computer. Check whether the target system boots using UEFI or legacy BIOS.

Windows 11, UEFI, Secure Boot and TPM

Windows 11's official hardware requirements include:

Compatible 64-bit processor
At least 4 GB RAM
At least 64 GB storage
UEFI firmware
Secure Boot capability
TPM 2.0
Compatible graphics hardware
Appropriate display requirements

Microsoft documents these requirements in its Windows 11 specifications.

One subtle but important point:

Secure Boot capability is part of the requirement.

That doesn't mean every troubleshooting situation should involve permanently disabling Secure Boot.

For a normal Windows 11 installation, leave Secure Boot enabled unless you have a specific compatibility reason to change it.

What About Unsupported Windows 11 Hardware?

You may see tools that offer options for bypassing Windows 11 hardware checks.

Those options exist, but they aren't equivalent to meeting Microsoft's requirements.

Installing Windows 11 on unsupported hardware can lead to compatibility problems and changes in Microsoft's support/update expectations.

For a normal production computer, the safest approach is to use hardware that meets Microsoft's requirements.

If you're experimenting with an old PC, understand the limitations before proceeding.

Method 3: Ventoy

Ventoy official website

Ventoy is particularly useful if you regularly install operating systems.

Instead of recreating the USB every time you want to use another ISO, you install Ventoy to the USB once and then copy ISO files onto it.

For example, one USB could contain:

Windows11.iso
Windows10.iso
Ubuntu.iso
Fedora.iso
Rescue.iso

When you boot from the USB, Ventoy displays a menu from which you can select the ISO.

Ventoy supports Windows ISOs and provides a WIMBOOT mode for some situations where the normal Windows ISO boot method doesn't work.

Secure Boot note

Ventoy has Secure Boot support, but its behavior and key-enrollment requirements can vary by firmware and Ventoy version.

If you're using Ventoy on a machine with Secure Boot enabled, follow Ventoy's current Secure Boot instructions rather than blindly disabling security features.

Method 4: balenaEtcher

balenaEtcher official website

Etcher is a simple graphical imaging utility available across major desktop platforms.

The basic workflow is:

Select the ISO.
Select the USB drive.
Start the flash operation.
Wait for verification/completion.
Eject the USB.

However, Windows installation media has some platform-specific details, particularly around FAT32 and large WIM files.

For Windows specifically, Microsoft's own tools or a Windows-aware tool such as Rufus may be a better choice when you want the fewest compatibility surprises.

The 4 GB FAT32 Problem

This is one of the most commonly misunderstood parts of Windows USB creation.

FAT32 has a maximum individual file size of approximately 4 GB.

Some Windows installation images contain a sources\install.wim larger than that.

Microsoft documents splitting the WIM into smaller .swm files when necessary.

For example:

sources\install.swm
sources\install2.swm
sources\install3.swm

Windows Setup can use these split image files.

This is one reason tools designed specifically for Windows installation media are convenient: they can handle the filesystem and WIM-size problem for you.

Creating Windows USB on macOS

If you're using a Mac, the process depends heavily on the type of Mac.

There are two major categories:

Intel Mac
Apple Silicon Mac

Intel Mac

Apple's Boot Camp technology supports Windows installation on supported Intel-based Macs.

Apple's current documentation specifically covers installing Windows 10 using Boot Camp on supported Intel Macs.

Boot Camp is not available on Apple Silicon Macs in the same way.

If you have an Intel Mac and want Windows alongside macOS, check Apple's documentation for your exact Mac model before proceeding.

Apple Silicon Mac

Apple Silicon Macs use ARM-based processors.

That means you should think in terms of Windows on Arm, not the traditional x64 Windows installation used by most Intel/AMD PCs.

Microsoft provides a Windows 11 ARM64 ISO specifically for ARM-based PCs and virtual machines.

For an Apple Silicon Mac, virtualization is generally the more appropriate route.

Depending on your requirements, you can use a compatible virtualization application and install Windows 11 Arm64 as a virtual machine.

Creating Windows USB on Linux

Linux gives you several options.

You can use:

Ventoy
WoeUSB-ng
A compatible graphical disk imaging utility
Manual Windows media preparation

WoeUSB-ng

WoeUSB-ng is designed specifically for creating Windows installation USB drives from Linux.

A typical command looks like:

sudo woeusb --device /path/to/windows.iso /dev/sdX

Be extremely careful with /dev/sdX.

The destination should be the USB device, not your Linux system drive.

Before running a destructive command, identify the USB carefully.

Using `lsblk`

Run:

lsblk

You'll see disks and partitions.

Example:

NAME        SIZE TYPE
nvme0n1     512G disk
├─nvme0n1p1 512M part
└─nvme0n1p2 511G part
sdb          32G disk
└─sdb1       32G part

In this example, sdb may be the USB drive.

But don't blindly assume.

A safer method is:

Run lsblk.
Unplug the USB.
Run lsblk again.
Plug the USB back in.
Run lsblk again.
Identify the newly appearing device.

Then double-check the size and device name.

Linux `dd`: Powerful but Dangerous

You can write an image using dd, but it should be treated as a destructive command.

Example:

sudo dd if=/path/to/windows.iso of=/dev/sdX bs=4M status=progress

Then flush pending writes:

sync

Finally, safely eject the USB:

sudo eject /dev/sdX

Replace /dev/sdX with the actual USB device.

Do not copy this command blindly.

If you accidentally use your internal drive as the of= destination, you can overwrite it.

macOS `dd`

The same principle applies on macOS, but device names are different.

First:

diskutil list

Identify the external USB disk.

Then unmount it:

diskutil unmountDisk /dev/diskN

where diskN is your USB device.

You can then use a block-level imaging command if the Windows media you're creating is compatible with the target firmware and tool.

For Windows installation media on Macs, however, a dedicated tool or the manufacturer's recommended method is often preferable to assuming that a raw dd write will work on every Mac.

Important: Don't Assume Every Windows ISO Works With `dd`

This is a correction worth making to many older Windows guides.

A raw ISO-to-USB write isn't universally equivalent to creating Windows installation media.

Windows media has considerations involving:

UEFI boot
FAT32
NTFS
install.wim
4 GB file-size limits
Firmware compatibility
USB partition layout

Booting the PC From the USB

Once your USB is ready:

Shut down the target PC.
Insert the USB.
Turn the PC on.
Open the boot menu.
Select the USB drive.
Windows Setup should load.

Common boot-menu keys include:

Manufacturer	Common boot key
Dell	F12
HP	Esc or F9
Lenovo	F12
Acer	F12
ASUS	F8 or Esc
MSI	F11
Gigabyte	F12
ASRock	F11
Microsoft Surface	Volume Down + Power

These keys can vary by model, so check the manufacturer's documentation if the listed key doesn't work.

You may see something like:

UEFI: SanDisk USB
SanDisk USB
Windows Boot Manager

On a modern UEFI system, choose the entry beginning with:

UEFI:

when available.

This helps ensure you're booting the installer in UEFI mode rather than legacy BIOS compatibility mode.

Before Installing Windows

Don't start deleting partitions until you've checked these things.

Backup your files

A clean installation can erase the Windows installation and its partitions.

Back up:

Documents
Photos
Videos
Projects
Browser data
Game saves
SSH keys
Important configuration files
School/work files
Any data stored outside your normal cloud backup

If the data matters, keep another copy.

Confirm your Windows edition

If your PC previously had Windows Home and you install a different edition, activation may not happen automatically.

Common editions include:

Windows 11 Home
Windows 11 Pro
Windows 11 Enterprise

A digital license can often reactivate Windows automatically on the same hardware, but edition and licensing details matter.

Check Windows 11 compatibility

Microsoft's minimum requirements include:

Compatible CPU
4 GB RAM
64 GB storage
UEFI
Secure Boot capability
TPM 2.0

For a supported installation, check Microsoft's current compatibility information before wiping the machine.

Download important drivers

This is especially useful for:

Custom-built desktops
Older laptops
Unusual Wi-Fi adapters
Ethernet adapters
ARM-based computers

If Windows Setup doesn't have your Wi-Fi driver, you may end up with no internet immediately after installation.

Download important drivers beforehand if the manufacturer provides them.

Installing Windows From USB

When Windows Setup starts:

Select your language.
Select your time and currency format.
Select your keyboard layout.
Click Install now.
Enter your product key if requested.
Select the appropriate Windows edition if prompted.
Accept the license terms.
Choose the installation type.

For a completely clean installation, choose:

Custom: Install Windows only

You will then see the disk and partition selection screen.

Be Careful With the Partition Screen

This is where you can permanently delete data.

You might see partitions such as:

Drive 0 Partition 1
Drive 0 Partition 2
Drive 0 Partition 3
Drive 0 Partition 4

Do not delete partitions just because their names look unfamiliar.

Recovery partitions, EFI partitions, manufacturer partitions, and data partitions may contain important information.

If the PC contains multiple drives, be especially careful.

"Windows Cannot Be Installed to This Disk"

Two common errors involve GPT and MBR.

Error: Disk has GPT partition style

This often means you're booting the installer in Legacy BIOS mode while the disk is configured for GPT.

The preferred solution on a modern system is usually:

Boot the installer in UEFI mode.
Use GPT for the Windows installation disk.

Error: Disk has MBR partition table

This can happen when Windows Setup is booted in UEFI mode but the target disk is still MBR.

For a modern installation, converting the disk to GPT is usually the better approach if you're intentionally wiping the disk.

Warning: Converting a disk as part of a clean installation can destroy existing data.

Do not run destructive disk commands until you have confirmed the correct drive and backed up anything important.

After Windows Finishes Installing

Don't consider the job finished when the desktop appears.

Do these things next:

1. Run Windows Update

Open:

Settings → Windows Update

Install available updates and restart when required.

Repeat until there are no important updates left.

2. Install manufacturer drivers

Check the computer manufacturer's support page for:

Chipset
Graphics
Wi-Fi
Bluetooth
Audio
Touchpad
Camera
Card reader
Power-management components

Windows Update handles many drivers automatically, but manufacturer drivers can still matter.

3. Check Device Manager

Open:

Device Manager

Look for devices with warning icons.

If something is missing, identify the hardware and install the appropriate driver from the manufacturer's official website.

4. Activate Windows

Open:

Settings → System → Activation

Check the activation status.

If you have a valid digital license for the same edition on the same hardware, Windows may reactivate automatically once the computer connects to the internet.

Common Windows Installation Problems

Try:

Another USB port
Another USB drive
Recreating the installation media
Checking UEFI settings
Checking whether USB boot is enabled
Selecting the UEFI USB entry
Updating firmware if appropriate

Some systems also have Fast Boot settings that can make it harder to enter the boot menu.

Problem: Windows Setup can't find the SSD

This can happen on some newer computers because of storage-controller configuration or missing drivers.

Check the computer manufacturer's documentation.

On some systems, changing storage-controller settings may affect existing installations, so don't randomly change BIOS storage settings without understanding what they do.

Problem: No Wi-Fi after installation

This usually means Windows doesn't have the appropriate Wi-Fi driver.

Possible solutions:

Connect temporarily through Ethernet.
Use a USB Ethernet adapter.
Download the Wi-Fi driver on another computer and transfer it using USB.
Install the manufacturer's driver package.

Problem: Windows says TPM 2.0 is missing

Check the UEFI/firmware settings for TPM-related options.

Depending on the hardware, the option may have a manufacturer-specific name.

For example, modern Intel and AMD systems may expose firmware-based TPM functionality through their firmware settings.

Don't disable security features just to make an installation work unless you understand the consequences.

Problem: Secure Boot is disabled

Windows 11 requires UEFI firmware that is Secure Boot capable.

If you're troubleshooting a bootable USB, check whether:

The computer is actually booting in UEFI mode.
The USB was created correctly.
The firmware is detecting the USB correctly.

If a third-party boot tool has its own Secure Boot requirements, follow that tool's current documentation rather than permanently disabling Secure Boot without a reason.

What If the ISO Is Too Large for FAT32?

FAT32 has a maximum individual file size of 4 GB.

If sources\install.wim exceeds that limit, you have several options.

Option 1: Use Rufus

Rufus can prepare Windows installation media and handle common Windows ISO limitations.

Option 2: Use WoeUSB-ng

Linux users can use WoeUSB-ng to create Windows installation media.

Option 3: Split the WIM manually

Microsoft documents using DISM to split a large WIM:

Dism /Split-Image /ImageFile:D:\sources\install.wim /SWMFile:E:\sources\install.swm /FileSize:3800

The resulting .swm files can be placed in the appropriate sources directory. Windows Setup supports split image files.

For most users, however, using a tool that handles this automatically is easier.

Installing Windows in a Virtual Machine

If you don't want to replace your current operating system, you can install Windows inside a virtual machine.

An ISO is particularly useful here.

Common virtualization platforms include:

Hyper-V
VirtualBox
VMware
UTM
Other compatible virtualization software

The exact configuration depends on your host operating system and CPU architecture.

For Windows 11 VMs, configure the virtual machine with the security features Windows 11 expects, such as Secure Boot and virtual TPM where supported.

Microsoft documents Windows 11 VM requirements and configuration considerations.

Installing Windows on an Old PC

If you're trying to revive an older computer, don't immediately assume Windows 11 is the right answer.

First check:

CPU compatibility
TPM 2.0
Secure Boot capability
RAM
Storage
Driver availability

If the hardware doesn't meet Windows 11's requirements, installing an unsupported configuration may create more problems than it solves.

A supported lightweight Linux distribution may be a better option for genuinely old hardware.

Windows Installation Checklist

Before starting:

During installation:

Boot the USB in UEFI mode
Confirm the correct target disk
Don't delete partitions accidentally
Choose the correct Windows edition
Complete Windows Setup

After installation:

Windows Installation Cheat Sheet

Situation	Recommended approach
Upgrade current Windows PC	Windows Update / Installation Assistant
Clean install on modern PC	Official ISO + bootable USB
Create USB from Windows	Media Creation Tool or Rufus
Multi-boot USB	Ventoy
Windows USB from Linux	WoeUSB-ng or Ventoy
Windows on Intel Mac	Check Boot Camp compatibility
Windows on Apple Silicon Mac	Windows on Arm VM
Snapdragon Windows PC	ARM64 Windows media
Old unsupported PC	Consider supported Linux instead
VM installation	Official ISO
Need to verify ISO	SHA-256

Official Resources

Microsoft

USB Creation Tools

Apple

Apple Boot Camp documentation

Frequently Asked Questions

Can I download Windows 11 for free?

Yes. Microsoft provides Windows installation media and ISO downloads without charging for the download itself.

However, using Windows still requires an appropriate license/activation depending on your situation.

Downloading an ISO and having a Windows license are two separate things.

Is it safe to download Windows from third-party ISO websites?

The safest choice is to download Windows directly from Microsoft.

Is Windows 11 26H1 the latest Windows?

26H1 is a newer Windows 11 release, but it isn't simply the next upgrade that every existing Windows 11 PC should install.

Microsoft describes 26H1 as a hardware-optimized release for select new devices, and existing devices aren't offered it as an in-place upgrade.

For most existing compatible PCs, 25H2 remains the relevant general-purpose release.

Do I need an ISO to install Windows?

No.

If you're using Microsoft's Media Creation Tool, it can create installation media for you.

An ISO is useful when you want more control, need a VM, or want to create the USB using another tool.

Can I install Windows without a USB?

Yes.

Depending on your situation, you can:

Upgrade an existing Windows installation.
Mount an ISO and run Windows Setup.
Install Windows inside a virtual machine.
Use a manufacturer recovery system.

A USB is mainly useful for a clean installation or when the existing operating system isn't booting.

Can I install Windows 11 on an ARM computer?

Yes, provided the device is supported and compatible.

Microsoft provides a Windows 11 ARM64 ISO. Some devices may require manufacturer-specific drivers during or after installation.

Can I install Windows on an Apple Silicon Mac?

You cannot use Intel-era Boot Camp in the same way on Apple Silicon Macs.

Apple's Boot Camp documentation applies to Intel-based Macs, while Apple Silicon systems use ARM-based processors.

For Apple Silicon, Windows on Arm virtualization is generally the practical approach.

Does copying an ISO to a USB make it bootable?

Usually, no.

Dragging:

Windows.iso

onto a USB simply copies the ISO file.

It doesn't necessarily create the boot structure required by the target firmware.

Use an appropriate media-creation tool or properly prepare the USB.

Can I use an 8 GB USB drive?

Microsoft specifies at least 8 GB for Windows installation media on its download pages.

A larger drive is fine and can be useful if you're using Ventoy or storing multiple ISOs.

Should I use GPT or MBR?

For a modern UEFI computer, GPT is normally the correct choice.

Use MBR mainly when you're dealing with a system that genuinely needs legacy BIOS booting.

Should Secure Boot be disabled?

Normally, no.

Windows 11 is designed around modern UEFI security features.

If a particular USB tool has a Secure Boot compatibility issue, troubleshoot that specific problem rather than automatically disabling Secure Boot permanently.

What happens if I clean install Windows?

A clean installation can remove the existing Windows installation, applications, settings, and data from the selected partitions.

Always back up important data before starting.

Final Thoughts

A Windows installation doesn't need to be complicated.

The safest approach is surprisingly simple:

Get the installation files from Microsoft. Verify them. Use the correct architecture. Create the USB carefully. Boot it in the correct firmware mode. Back up your data before touching partitions.

Most Windows installation disasters aren't caused by Windows Setup itself. They're caused by rushing through the steps before Setup starts.

Take five minutes to identify your hardware, confirm your USB drive, check your backups, and verify your ISO.

That small amount of preparation can save hours of troubleshooting later.

Install from a clean source, keep your drivers ready, run Windows Update after installation, and you'll have a much better starting point.

Last reviewed: August 11, 2026

How to Download and Install Windows in 2026: The Complete Guide

Quick Answer: What's the Best Way to Install Windows?

Windows 11 in 2026: 25H2 vs 26H1

Windows 11 25H2

Windows 11 26H1

Step 1: Download Windows From Microsoft

Official Windows 11 download page

Windows 11 ARM64 download page

Windows 10 download page

Which Windows Download Method Should You Use?

Option 1: Windows Installation Assistant

Option 2: Media Creation Tool

Option 3: Download the Windows ISO Directly

Typical ISO workflow

x64 or ARM64: Which ISO Do You Need?

x64

ARM64

How to check your architecture

Windows 11 ARM64 Installation

Should You Verify the Windows ISO?

Verify on Windows

Verify on macOS

Verify on Linux

What if the hash doesn't match?

A Note About Direct Microsoft Download Links

Windows 10 in 2026: Should You Still Install It?

Windows 10 Extended Security Updates

What About Windows 7 and Windows 8.1?

Creating a Bootable Windows USB

Method 1: Microsoft's Media Creation Tool

Method 2: Rufus

GPT or MBR?

Windows 11, UEFI, Secure Boot and TPM

What About Unsupported Windows 11 Hardware?

Method 3: Ventoy

Secure Boot note

Method 4: balenaEtcher

The 4 GB FAT32 Problem

Creating Windows USB on macOS

Intel Mac

Apple Silicon Mac

Creating Windows USB on Linux

WoeUSB-ng

Using lsblk

Linux dd: Powerful but Dangerous

macOS dd

Important: Don't Assume Every Windows ISO Works With dd

Booting the PC From the USB

UEFI Boot Menu: What Should You Select?

Before Installing Windows

Backup your files

Confirm your Windows edition

Check Windows 11 compatibility

Download important drivers

Installing Windows From USB

Be Careful With the Partition Screen

"Windows Cannot Be Installed to This Disk"

Error: Disk has GPT partition style

Error: Disk has MBR partition table

After Windows Finishes Installing

1. Run Windows Update

2. Install manufacturer drivers

3. Check Device Manager

4. Activate Windows

Common Windows Installation Problems

Problem: USB doesn't appear in the boot menu

Problem: Windows Setup can't find the SSD

Problem: No Wi-Fi after installation

Problem: Windows says TPM 2.0 is missing

Problem: Secure Boot is disabled

What If the ISO Is Too Large for FAT32?

Option 1: Use Rufus

Option 2: Use WoeUSB-ng

Option 3: Split the WIM manually

Installing Windows in a Virtual Machine

Installing Windows on an Old PC

Windows Installation Checklist

Windows Installation Cheat Sheet

Official Resources

Microsoft

Using `lsblk`

Linux `dd`: Powerful but Dangerous

macOS `dd`

Important: Don't Assume Every Windows ISO Works With `dd`