Microsoft recommends that you use the ChangeVLKey2600.vbs script on Windows XP-based computers that are not running SP1 and that you use the ChangeVLKeySP1.vbs script on Windows XP-based computers that are running SP1.
Attached here are ChangeVLKey2600.vbs and ChangeVLKeySP1.vbs, compressed in a single RAR archive. Extract the relevent vbs file to C:\.
The following example describes how to use the ChangeVLKeySP1.vbs script from a command line:
Click Start, and then click Run.
In the Open box, type the following command, where AB123-123AB-AB123-123AB-AB123 is the new product key that you want to use, and then click OK:
c:\changevlkeysp1.vbs ab123-123ab-ab123-123ab-ab123
Source:
http://support.microsoft.com/default...b;en-us;328874
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