willi dude if you use your computer for home based shyte like gaming etc
use 64 bit windows
if you use it for work and the like the only problem windows xp 64 bit has, is printer support.
printer companies are only making new printers with new x64 bit drivers
other than that your printers not working, you can find almost every driver for hardware
before you install it though make sure you have your m/b drivers are x64 bit ready by checking the website of the manufact

also try and have a 1 gig or more memory 2-4 gig would be good
if you can go x64 go x64
