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