as much as i hate to jump on the dis vista bandwagon, i think the only time id pick vista over xp is if it was the primary os, you were using it for stuff other than gaming, and the computer had really great specs. if youre just playing games, get xp. this way you know there will be no problems, and you can always upgrade to vista since thers nothing on it but games anwayy. im in a similiar situtation, i instlaled vmware with vista. it actually runs great, but i dare not run game son it, id have to use bootcamp. i only FPS really anymore (tf2) and i play on a 32 inch lcd tv, so i dont think i could play on a laptop cause the small screen would impair my aim. id have to start on a laptop and switch up, lol