It isn't always the best choice to download the latest drivers, as some can cause instability in your system for various reasons. However there isn't much choice of drivers for the 8 series yet. 64Bit driver will likeley not work at all/or unstable on a 32Bit OS. I think the driver you need will be labeled Windows XP/Media Centre Edition.
Corsair HX 620W
eVGA 8800GTS 320MB
CoolerMaster Centurion 5
OCZ 2x1GB Revision 2 PC6400 800Mhz