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Written by Super User
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- Click Start and type CMD in the Start Search menu
- Right Click and choose Run as administrator
- To remove any existing product key (in case you used a trial key), enter and run the command slmgr.vbs /upk .
- Clear the product key
- 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.
- Lastly, activate Windows by entering the command slmgr.vbs /ato
- Windows is now activated.
- from registry by running slmgr.vbs /cpky
