Firstly, boot camp ---> win xp pro (300mb version cutting out all the crap) i installed bioshock first, NOOO go... wasnt playable..? then Diablo 2 just now.. everything was choppy but playable.. except in high fps places.. like bosses etc.. is it the xp i downloaded?? should i get vista?? also it says PC/MAC on the d2 case but it gives me a weird error if i put it on my mac OS Any help/advice appreciated!!