To change the product key in Office XP, open up the Registry Editor by typing "regedit" (without the quotations) in the 'Run' command box. Navigate to the following:
CODE
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\10.0\ Registration\{xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}
Note that the 'x's stand for any random letter or number. Delete the DigitalProductID and ProductID keys. After you delete them, close out of the Registry Editor and open up any Office XP program. Office will prompt you to enter a new product key.
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