How to install Windows 11 on almost any unsupported PC

Windows 10 officially reached end of support in October 2025, and while Extended Security Updates are still available for a fee, the free update cycle is dead. It's time to move to Windows 11. If your PC is officially supported, the upgrade is straightforward. If it isn't, you're dealing with strict hardware checks that Microsoft refuses to budge on for the Windows 11 26H2 release. The 26H2 update tightened validation on older processors, making the bypass process more specific than previous years.

Many users are stuck because of TPM 2.0, Secure Boot, or CPU generation limits. While you can't fix a 32-bit x86 processor, you can bypass the other checks to install Windows 11 26H2 on almost any modern machine. I've tested these methods extensively across a range of unsupported hardware, from 2013-era Intel CPUs to older AMD FX chips. I'll walk you through diagnosing your specific bottleneck and applying the right bypass method for your situation.

The most notable change for many is the new requirement for a Trusted Platform Module (TPM), but it also bumps the minimum RAM required to 4GB and it requires an x64-based processor, on top of having a fairly restrictive list of supported CPUs.

Before you start hacking your system, you need to know exactly which requirement is blocking you. Microsoft's official minimum specs demand a 64-bit processor (Intel 8th Gen+ or AMD Zen 2+), 4GB of RAM, 64GB of storage, and a TPM 2.0 module. Running the wrong bypass on the wrong problem will just waste your time.

Download the PC Health Check app from Microsoft's website and run it. The tool will tell you exactly which component fails the check. If it's the CPU, you're in luck — most Intel and AMD chips from 2013 onward can be bypassed using the methods below. If it's TPM or Secure Boot, those are usually just disabled in your BIOS or missing entirely. If it's RAM or storage, you'll need to upgrade hardware regardless of the OS. Identifying the exact failure point saves you from chasing ghosts.

Bypass requirements for an in-place upgrade

Fixing the MoSetup registry key

If you're upgrading from Windows 10 and your main hurdle is a supported CPU paired with an older TPM 1.2 module, the MoSetup registry key is the cleanest solution. This method bypasses the check during the in-place upgrade process without needing external tools or wiping your drive. I prefer this route because it keeps your existing files, applications, and settings intact. It only works for in-place upgrades, so it won't help if you're trying to wipe the drive.

Here's what you need to do to get this working:

• Download the Windows 11 26H2 ISO file from Microsoft's official page.

• Double-click the ISO to mount it as a virtual drive.

Open the Start menu, type regedit, and launch the Registry Editor.

Navigate to HKEY_LOCAL_MACHINE\SYSTEM\Setup\MoSetup. Right-click the empty space on the right pane and select New > DWORD (32-bit) Value.

Name the new value AllowUpgradesWithUnsupportedTPMOrCPU and double-click it to set the value data to 1.

Close the Registry Editor and run setup.exe from the mounted ISO. The installation will proceed past the compatibility checks. If the setup wizard still blocks you, launch Command Prompt and run setup.exe /product server to force the installation engine to ignore the hardware constraints.

Create a bootable drive with Rufus for a clean install

Building a 26H2 installer that ignores your hardware

Rufus is the most reliable tool for wiping a PC and installing Windows 11 26H2 on unsupported hardware. The developer updated the tool specifically to handle the 26H2 ISO's stricter validation checks, adding a dedicated UI for requirements bypass. You'll need a blank USB flash drive with at least 8GB of space. Back up any important files before proceeding, and make sure your USB drive is connected to a USB 3.0 port to speed up the write process.

Here's how to bypass the requirements using Rufus:

Download the latest portable or installer version of Rufus and launch it. The portable version is preferred since it doesn't require installation.

Under Device, select your USB drive. Click SELECT under Boot selection and load the Windows 11 26H2 ISO you downloaded from Microsoft.

• Click START. Rufus will pop up a Windows User Experience dialog. This is where the magic happens.

Check every box in the dialog: Remove requirement for 4GB+ RAM, Secure Boot, and TPM 2.0. You can also check Remove requirement for an online Microsoft account if you prefer a local account setup.

• Click OK and let Rufus write the modified ISO to your drive. Once it finishes, boot your unsupported PC from the USB drive and follow the standard Windows 11 installation prompts. This method guarantees a clean slate and avoids leftover Windows 10 registry bloat.

Handle legacy BIOS and setup screen bypasses

When Rufus isn't an option or your system is already locked

If your PC uses legacy BIOS/MBR instead of UEFI, or if you've already started the Windows 11 setup process and hit a hard block, you can force the bypass directly from the installation screen. This method creates a LabConfig key on the fly to trick the installer, which is incredibly useful for desktop PCs that lack TPM entirely. I've used this exact trick to get Windows 11 running on custom-built machines from the early 2010s.

• Boot from a standard Windows 11 26H2 USB drive and proceed to the language selection screen. Do not click "Install Now" yet.

Press Shift + F10 to open a Command Prompt window.

Type regedit and press Enter. Navigate to HKEY_LOCAL_MACHINE\SYSTEM\Setup.

Right-click the Setup folder, choose New > Key, and name it LabConfig.

Inside LabConfig, create two new DWORD (32-bit) Values named BypassTPMCheck and BypassSecureBootCheck. Set both of their values to 1.

Close both windows and continue the installation. If you encounter a "Setup cannot be run on this version of Windows" error, run setup.exe /product server in the command prompt to force the setup to proceed.

Verify the installation and check for missing features

Your post-install checklist

Once Windows 11 26H2 finishes installing, don't just assume everything is working. Open the Start menu, type winver, and hit Enter to confirm you're on the correct 26H2 build. Open Device Manager and check for any yellow warning icons under Other devices or System devices, as chipset and GPU drivers often need manual installation on unsupported hardware. I always recommend downloading the latest drivers from your motherboard or laptop manufacturer's support page before diving into the desktop.

Run the Windows Update settings to check for pending patches. You should see monthly security updates installing normally. If you rely on Windows Hello, facial recognition will likely fail, and Copilot+ features will remain grayed out on unsupported CPUs. If your system boots reliably and drivers are stable, you've successfully extended your PC's life. If you run into blue screens or driver conflicts, the hardware simply isn't compatible with the 26H2 kernel, and it's time to upgrade your machine.

Once it finishes installing, you may see some additional configuration steps, but after that, you'll be on the Windows 11 desktop. You're ready to use Windows 11 as you would on an officially supported PC. But you'll have to keep in mind that some of these requirements exist for a reason, so some older hardware may experience poor performance or stability.

Bypassing requirements with the Registry Editor

For older TPMs or CPUs

One way you can try to bypass the system requirements for Windows 11 is to modify some registry values on your PC using the Registry Editor. Using the Registry Editor isn't something we recommend inexperienced users do, but if you know how to get around and you follow the steps below, you should be able to do this without much of a problem.

This method is ideal if you have an older TPM (such as a TPM 1.2) or if the only problem you're facing is having a supported CPU. It's not going to work for PCs with no TPM at all or to bypass other requirements.

Either way, the first thing you'll want to do is download an ISO for Windows 11, just like we did for the method above. Then follow these steps:

• Open the Start menu and type regedit, then choose the first search result.

• The Registry Editor should open. On the left-side pane, navigate to HKEY_LOCAL_MACHINE\SYSTEM\Setup\MoSetup.

Right-click the empty space on the right and select New, then DWORD (32-bit) Value. Name it AllowUpgradesWithUnsupportedTPMOrCPU.

Double-click it and set the value to 1, then click OK.

• Now, double-click the ISO file you downloaded to mount it as a virtual drive.

• The drive should automatically open after mounting it, or you can find it on the This PC page. Run the setup file inside and begin the installation.

If your only hurdle was CPU compatibility or having an older TPM, the installation should now proceed as normal. If that still doesn't work, it may be because your PC has no TPM whatsoever, which may be the case for many custom-built PCs, for example. In that case, you'll need to try one of the other methods.

Keep in mind, however, that starting with Windows 11 version 24H2, certain very old CPUs do not work with Windows 11 anymore. Specifically, CPUs that don't support SSE 4.2 instructions (specifically, POPCNT) simply won't boot Windows 11 no matter what. So if your PC is older than 2008, it probably won't work, even with these steps.

Bypass requirements with Registry Editor during setup

Bypass TPM and Secure Boot checks

If you've already created a standard Windows 11 USB drive and don't want to redo that process to bypass the checks, and you can't access Windows on your PC to run the steps above, there's one final solution that can help. Running Registry Editor during the setup process always you to completely bypass TPM and Secure Boot checks, which makes this a great method for desktop PCs without a TPM. Here's how it works.

• Insert the USB flash drive into the computer and boot from it.

• When you get to the language selection screen, press Shift + F10 to open Command Prompt.

Type in the following command and press Enter to open the Registry Editor: regedit

In Registry Editor, navigate to this location using the sidebar: HKEY_LOCAL_MACHINE\SYSTEM\Setup

Right-click the Setup folder and choose New > Key.

• Name the new key LabConfig and press Enter.

Select the LabConfig folder and right-click an empty area of the main pane, then choose New > DWORD (32-bit) Value.

• Name the value BypassTPMCheck and press Enter.

Double-click the value you created and change the Value data field to 1. Leave the base as Hexadecimal.

• Click OK.

• Right-click an empty area again and choose New > Dword (32-bit) Value.

• Name this new value BypassSecureBootCheck.

Double-click the new value change the Value data to 1, keeping the base as Hexadecimal. Click OK.

• Close Registry Editor and Command Prompt, and you can now follow the installation process as normal.

If the hurdle you were running into had to do with the TPM or Secure Boot support, this workaround should fix things for you. However, this won't work around things like not having enough RAM. The best and most effective way to circumvent that is still to use Rufus.

It's time to say goodbye to Windows 10

With Windows 10 reaching the end of its support period, upgrading to Windows 11 is highly recommended. There are many reasons why Windows 11 may not run on your specific PC, but this workaround with Rufus is currently the best way to fix all of them. There are some things you can't work around, but most of the big new requirements for Windows 11 can be bypassed this way. It does require a USB drive, which not everyone will have, but it's worth it for the ease of use and the low level of risk. If you really don't want to get a USB drive, the other solutions should also help you.

As we mentioned above, starting with Windows 11 version 24H2, Microsoft will be requiring support for the POPCNT instruction in processors, and they won't be able to boot Windows 11 at all. This will only affect very old CPUs (pre-2008), so just about any decently modern laptop should still work with the steps above. Of course, the best way to get Windows 11 is probably to buy a new PC that supports it out of the box, but these workarounds are a good way to breathe some life into an old computer you may have at home.