I am running XP Home, and was wondering if it is a 32 or a 64 bit version. I have an idea that since it is an older puter HP Pavilion 751n Desktop that originally had 256 mb of ram, it is a 32. If so, what can I do to go to a 64 bit version, and is it even possible? I am running a 1.8 gig processor with 1.5 gig of ram (upgraded)