How to Change Your Windows Product Key After Install & Activate

Via command line to change the Product key:
  • Click on the Start Button and type: CMD (into the ‘Search programs and files’ field in the Start Menu).
  • The Start Menu will show ‘CMD.exe’,
  • Right-click the CMD.exe file and select Run As Administrator .
  • In the CMD window, type: slmgr.vbs -ipk <type your product key here.>
  • To activate windows after changing the key, type: slmgr.vbs -ato