windows 7 64 bit was the answer for me. tried xp, not so good, windows 7 32 bit, was buggy, but I put windows 7 64 bit on a second partition just to try it, and that was it, It is really quite playable now. I have i3 cpu, 550 ti video card, 4 gigs ram. x fi sound, had to get a new wifi adapter for the 64 bit, my old one won't go with the driver I got. best of luck.