I have a legit windows 10 key that I got from my old computer, but it won't let me activate windows. What should I go?
you can use the Activation troubleshooter to help reactivate Windows
The type of device you’re activating doesn’t match the type of device you linked to your digital license.
You reached the limit on the number of times you can reactivate Windows on your device.
If you’re signed in using the correct Microsoft account, here are some additional reasons why you can’t reactivate Windows:
The edition of Windows on your device doesn’t match the edition of Windows you linked to your digital license.
The type of device you’re activating doesn’t match the type of device you linked to your digital license.
Windows was never activated on your device.
You reached the limit on the number of times you can reactivate Windows on your device.