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Changing the XP Serial Key

  • Start => Run

  • regedit

  • Navigate to the WPAEvents Registry (HKEY_LOCAL_MACHING/SOFTWARE/Microsoft/WindowsNT/WPAEvents)

  • Modify the OOBETimer Registry Value. (Change a couple of the numbers to anything else.)

  • Close the Registry

  • Start => run

  • %systemroot%\system32\oobe\msoobe.exe /a

  • That will start activate process. Click on the Telephone a customer service rep.

  • Then click on "change product key" at the bottom.

  • enter new key and press update.

  • It should now be able to activate again.