I doubt it that it would be anything else than my GPU then.
I'm running Vista on 3gigs of ram, 8600gt, Intel core 2quad CPU Q6600 @2.40ghz

and as I said it runs on 40% cpu, and 70% memory

Thanks for the great replys so far, made up my mind to buy a 8800gts!

Anyway what is up with this dual GPU? should I just keep my card in it and buy the 8800gts and let them put both in by the store? what is the difference?