to make geninune xp

Windows XP SP2 geniune key...
JG28K-H9Q7X-BH6W4-3PDCQ-6XBFJ


Hkey_local_machine\Software\Microsoft\WindowsNT\Current Version\WPAEvents

OOBETimer

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

Select 'Yes, I want to telephone a customer service representative to activate Windows', then click next.

Change Product key"

Type the new product key into the small white text fields and then click update.

Check that you get a message similar to 'You have successfully activated your copy of Windows.', if you do, restart your computer, and you're done!