If you have changed the motherboard and CPU in your computer and are now unable to activate Windows, it's possible that the hardware change has caused Windows to become deactivated. This can happen if the hardware change was significant enough to trigger Windows' activation systems to think that the operating system has been installed on a new computer.
To reactivate Windows, you will need to follow these steps:
- Press the Windows key + R to open the Run dialog.
- Type "slui.exe 4" into the Run dialog and press Enter.
- Follow the prompts to enter your product key and reactivate Windows.
If you do not have your product key, you can try to retrieve it by following these steps:
- Press the Windows key + R to open the Run dialog.
- Type "cmd" into the Run dialog and press Enter.
- In the command prompt, type "wmic path softwarelicensingservice get OA3xOriginalProductKey" and press Enter.
This will display the product key that was used to originally activate Windows on your computer. You can use this key to reactivate Windows after the hardware change.
If you are still unable to reactivate Windows after trying these steps, you may need to contact Microsoft support for further assistance.