I would stay away from XP SP3 for now. MS has pulled this thing off the shelf once before. My understanding is that some AMD based systems are having problems with this update and patches are available.

http://blogs.zdnet.com/microsoft/?p=1403

George K. Fahnbulleh

"The illiterate of the 21st century will not be those who cannot read and write, but those who cannot learn, unlearn, and relearn." ~ Alvin Toffler