Change Windows 7 Key

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  1. Click on the Start Button and type: CMD (into the 'Search programs and files' field in the Start Menu)
  2. The Start Menu will show 'CMD.exe', 
  3. Right-click the CMD.exe file and select Run As Administrator.
  4. In the CMD window, type: slmgr.vbs -ipk <type your product key here>
  5. To activate windows after changing the key, type: slmgr.vbs -ato