How to fix Windows 11 activation errors after a motherboard or hardware change

Windows KB-515

Summary

This guide helps you troubleshoot and resolve: How to fix Windows 11 activation errors after a motherboard or hardware change. Follow the steps below to fix the issue.

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Common Causes

When you replace a motherboard, CPU, or other major hardware components on a Windows 11 PC, Microsoft may treat the device as a new computer. This often triggers activation errors such as "Windows is not activated" or prompts asking you to enter a product key again. Because Windows 11 digital licences are tied to your hardware, a significant change can break that link. The good news is that this is usually fixable without purchasing a new licence. This guide walks you through the steps to reactivate Windows 11 after a hardware change.

Before You Begin

Before troubleshooting, gather the following information so you can reactivate smoothly:

Your Microsoft account email and password (the one linked to your Windows licence, if applicable).
Your original product key, if Windows 11 was activated using a retail licence rather than a digital licence.
Access to your old PC, if possible, to confirm the previous activation method.

Windows 11 digital licences are tied to your hardware. If you upgraded from Windows 10 to Windows 11 using the free upgrade offer, your licence is a digital one and is linked to your Microsoft account.

Quick Fix Steps

If you are seeing a "Windows is not activated" watermark or error message, try these steps in order:

Confirm your PC is connected to the internet.
Open Settings > System > Activation.
Click Troubleshoot under the activation status.
Select Recently changed hardware on this device and click Next.
Sign in with your Microsoft account and select your PC from the list of devices.
Tick This is the device I'm using right now and click Activate.

If activation completes successfully, you are done. If not, continue to the detailed troubleshooting below.

Detailed Troubleshooting

Step 1: Confirm Your Current Activation Status

Press Win + I to open Settings.
Navigate to System > Activation.
Note the activation status and the licence type shown (for example, "Windows 11 Pro digital licence" or "Windows 11 Home OEM").

The licence type matters. OEM licences are tied to the original motherboard and generally cannot be transferred. Retail licences can be moved to a new motherboard. Digital licences linked to a Microsoft account can often be reactivated using the troubleshooter.

Step 2: Run the Activation Troubleshooter

The built-in troubleshooter is the fastest way to reactivate Windows after a hardware change.

Open Settings > System > Activation.
Click Troubleshoot.
Choose I changed hardware on this device recently.
Click Next and sign in with your Microsoft account when prompted.
Select the PC you are activating from the list of devices linked to your account.
Tick the box next to This is the device I'm using right now.
Click Activate.

Wait for the process to complete. A confirmation message should appear once Windows is reactivated.

Step 3: Sign In With the Correct Microsoft Account

If the troubleshooter cannot find any devices, you may be signed in with the wrong Microsoft account.

Go to Settings > Accounts > Your info.
Confirm the Microsoft account listed matches the one used during the original activation.
If you have multiple accounts, sign out and sign back in with the correct one.
Return to System > Activation and run the troubleshooter again.

Step 4: Enter a Product Key Manually

If your licence is a retail product key rather than a digital licence, you can enter it directly.

Open Settings > System > Activation.
Click Change product key.
Enter your 25-character product key and click Next.
Follow the prompts to complete activation.

Do not share your product key publicly. If you purchased your key from 220 Internet Services, keep your invoice handy for verification.

Step 5: Check for Activation Errors in Settings

If activation fails, the activation page will display a specific error code. Common codes include:

0xC004F211 — The product key has already been used on another device. You may need to deactivate the old device first.
0xC004F213 — The product key cannot be used for a clean installation of this edition of Windows.
0x803F7001 — A valid licence was not found. Sign in with the correct Microsoft account.
0xC004C003 — The product key is invalid or no longer valid.

Note the error code and search the Microsoft Support site for specific guidance, or Open a Ticket with 220 Internet Services for assistance.

Step 6: Contact Microsoft Support

If the troubleshooter cannot reactivate Windows and you do not have a retail product key, you may need to contact Microsoft Support directly. They can help transfer a digital licence to your new hardware, particularly if you can no longer access the original device.

Visit the Microsoft Windows Support page.
Open a chat or phone session and explain that you have replaced hardware and need help reactivating.
Provide the error code and any proof of purchase if requested.

Preventing Activation Issues After Future Hardware Changes

To make future upgrades smoother, take these steps before changing hardware again:

Confirm your Microsoft account is linked to your Windows licence under Settings > System > Activation.
Keep a record of your product key in a secure location.
Save your proof of purchase, especially for retail licences.
Run the activation troubleshooter immediately after a hardware change rather than waiting for errors to appear.

Still Having Issues?

Need more help? If the issue persists after trying these steps, please open a support ticket and our team will assist you.

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