New hardware won't recognize existing, legal windows key

James Lee 0 Reputation points
2026-09-18T00:16:47.47+00:00

I recently upgraded the motherboard and CPU on my desktop. I have the same hard drives and everything else, however it won't recognize my windows installation. I have tried entering what I though was the key but it says it's not valid. Help guides say to go to the receipt of purchase for a key, which I kept, but it doesn't have a key on it. The windows purchase even shows in my Microsoft store order history but no key, and yet, here I am. How can I fix this?

Windows for home | Windows 11 | Licensing and activation
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  1. EmilyS726 267.1K Reputation points Independent Advisor
    2026-09-18T00:50:18.5866667+00:00

    James, when you purchased the license, it was through Microsoft, right?

    Did you purchase the Windows 11 Home license, or the full copy of Windows 11 Pro? Or did you purchase an upgrade license to upgrade from Home to Pro?

    If you have the full copy of license, meaning, not the upgrade license, have you already tried this?

    Go to Settings > System > Activation, run the troubleshooter, choose the hardware change option. When it asks you where it is installed on right now, you should choose the old device name. Then click on Activate button. And on the next screen when it asks you where to transfer it to, choose your new device name. See if that does the trick.

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