Is anyone else here running Windows XP x64? If so does Civilization 4 run well? I guess in the worst case I can always install my old copy of XP and dual boot, but I'd prefer not to. So far x64 has been really good w.r.t compatibility with games... some game installers need to be modified so they'll install (Doom 3 expansion and Vampire Bloodlines are two that I can think of right away) but run perfectly once installed. Ordinarily I wouldn't be worried about the compatibility, but I've been reading that it comes with a slightly newer version of DirectX that needs to be installed.