probly correct, which is one of the reasons I left halo2 for PC on the shelf at the store LOL, it required VISTA and LIVE... even though the PC is much better at 3d than the xbox 360, via 2x 8800gts sli, core 2 e6600, raid, sli memory etc... Adding vista would probly DEGRADE the performance down to that of the 360 HEH..