Ok i just built a new computer with ista 64-bit/8800gt/quad core 2.4Ghz cpu/6801sli mobo/4gb ram.
And when i play gmod with all my settings up it sorta laggs fps wize i get 50-40-30 fps in game when i get like 200 in css and my other games i dont understand i never had this slight lag on xp.
I had a laptop before this computer that i built and it was nice and it had vista and it slightly lagged on there also.
But the funny thing is even when i turn all the settings to all low it still gets the same fps.
I have tried everything from graphics drivers to running the game as administrator and in compatibility mode non of that works at all.
I think it is vista but you never know plz some one let me know if they have the same problem plz or anything similar.