I just installed Crysis 2, and after playing it for a little bit it began freezing repeatedly. I've tried updating my audio and video drivers, clearing my temp folder, and closing all other programs. Nothing has worked.

My computer is an Alienware M17x R1 with Windows Vista 64 bit.
Graphics: 2 nVidia GTX 260M cards in SLI.
Sound: IDT High Definition Audio CODEC

Any help or advice is greatly appreciated.
Thanks.