I'm going to sound a bit negative but
-You should leave SLI disabled.
-There's no native support for the 360 gamepad on PC
But if you want to play it with a 360 gamepad, perhaps you have a 360, and if so, you might try checking it out on Xbox360. It really plays quite well now and is obviously optimized for playing with a 360 controller.
Yeah i do have a 360 but i really prefer playing the game with max settings at 1920x1080 on pc rather than the 720p resolution of the 360 version ; )
Out of curiosity though, will there be a new demo on the 360? so i could see how this version runs on it?