yes but the problem at the moment is that all software is pretty much designed and written for 32 bit, meaning that any 64 bit version will be ported from that, and can cause problems,
maybe I will stick to the 32 bit then change over later.
Use 64bit version if you want more than 4GB of ram, otherwise there isnt much difference, excpet you cant upgrade 32bit XP to 64bit Vista, you have to do a clean wipe and a fresh install.