When I enter Crysis 2 that show one Table with write" Unsupport this Grapid Card and you will be Crash in game" and then I log in Game with Signer Play. After the Movie to show the "Crysis 2" I was Crash game.
I just update Driver of my Garpid Card in nVidia site with version 270.61
That may PC:
Chip: Core 2 Duel 3.0Ghz
Ram: 4G
Grapic card: nVidian 8400GS
I use Windown 7