Windows Vista & Windows 7: Removal of the Product Key and Activation using the Command Prompt

Press the Start Button and in the search box type in CMD

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Right click CMD.exe and select run as an administrator. This will open up the elevated command prompt accept any user account control prompt.

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In the Window type slmgr.vbs /upk and then press enter.

You will get a uninstalled product key dialogue box and also perhaps this:

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