|"Support for Windows XP Service Pack 2 will end on July 13, 2010.|
Learn how to download Windows XP SP3 now."
From ms site also below.
There's no SP3 for the 64-bit version of Windows XP. If you're running the 64-bit version of Windows XP with SP2, you have the latest service pack and will continue to be eligible for support and receive updates until April 8, 2014. To find out what version you're running, see Is my PC running the 32-bit or 64-bit version of Windows?
I support the 'Everybody Draw Mohammed Day'. A religion doesn't deny my freedom.