im running vista ultimate 32 bit and i have yet to ind a game that didnt run well on it
actually i havent really found any bugs in it at all
there are a couple of annoying features but you can disable them, just like in xp
EDIT: nvm just remembered that i had problems with my wireless internet, there were no drivers for it, but not that big of a deal just hook in a Ethernet cable instead and worked right away