Windows XP - Fake SP2 version

If you're on SP1 and refusing to upgrade, you can trick applications into beleiving you're on SP2 by modifying this registry key.

Go to: "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Windows"
And change "CSDVersion" from the SP1 value (0x00000100) to SP2 value (0x00000200)
I'd assume that the SP3 value is (0x00000300)