I am adding 2 more gigs of memory to the computer in my sig. I have xp 32bit now and since 32 cant see all 4GBs I am going to reinstall windows. I mostly play games L4D, Crysis, GTA4 and do some photo editing. My girlfriends laptop has vista on it so I have used vista quite a bit, just not on gaming desktop. What should I go with?