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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 (followed by the product key)
To activate windows after changing the key, type: slmgr.vbs -ato
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