[Bee_Dee_3_Dee]

Why is Doom 3 flawless on a GTX295 running Vista, but Doom 3 on a GTX280 running Vista is not?

(Doom 3 was 99% flawless on an 8800GTX running WinXP. But Doom 3 on 8800GTX running Vista sucked so bad i stopped playing it.)

Thanks anyone.