Answers for "how to get my windows product key"

get windows product key cmd

wmic path softwarelicensingservice get OA3xOriginalProductKey (do this in cmd, as administrator, Windows/system32)

how to check your windows product key

you can check it on the command line

1) Press Windows key + R
2) Write cmd and press the Enter/Return key
3) Copy and paste the following command:
wmic path SoftwareLicensingService get OA3xOriginalProductKey
4) Press the Enter key again
5) If this doesn't work run the command line as Administrator and try again