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  1. Click Start and type CMD in the Start Search menu
  2. Right Click and choose Run as administrator
  3. To remove any existing product key (in case you used a trial key), enter and run the command slmgr.vbs /upk .
  4. Clear the product key from registry by running slmgr.vbs /cpky
  5. To enter your new product key, use the command: slmgr.vbs /ipk xxxxx-xxxxx-xxxxx-xxxxx where the x’s are your actual product key.
  6. Lastly, activate Windows by entering the command slmgr.vbs /ato
  7. Windows is now activated.

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Hope this gets you out of a sticky Quibble