Looks like there is a problem with I7 systems using GTX2xx cards. Game crashes to desktop while arma2.exe is still running in taskmanager. There's a thread about it over at Nvidia forums here: http://forums.nvidia.com/index.php?showtopic=106799
I just upgraded to I7 and i can't play ArmA 2. The game crashes constantly. Are you BIS guys aware of the problem?