I've read this once in a forum, not tested but you can try to use this method:
Change sp2 to sp3 :
Run, type Regedit.
Backup Regedit.
Then go to HKEY_LOCOL_MACHINE \ SYSTEM \ CurrentControlSet \ Control \ Windows.
CSDVersion, right click, select Modify to display Edit DWORD Value for sp2, it is usually 200. change it to 300 and then choose OK
Close the Registry Editor.
Reboot the machine. The machine will now think that you’ve applied SP3 when you’re actually running Windows XP SP2.
[Only registered and activated users can see links. ]
[Only registered and activated users can see links. ]
Use at your own risk