1. Click the Windows start icon in the lower-left of your screen and type in cmd.
2.Right-click on the icon that comes up and click “Run as administrator”.
3.In the new window type in the following command and press Enter:
wmic path softwarelicensingservice getOA3xOriginalProductKey
4. You should then see your product key listed:
Fromhere you can copy the key and enter it into the Windows Activation screen, andthe unit should activate.