From Valve (the creators of Counter-Strike, Half-Life and more) comes Left 4 Dead, a co-op action horror game for the PC and Xbox 360 that casts up to four players in an epic struggle for survival against swarming zombie hordes and terrifying mutant monsters.
Left 4 Dead system requirements
Operating System: Windows XP / Vista / 7 - 32 or 64 bit
Processor: Pentium 4 3.0GHz
Graphics Card: 128 MB, Shader model 2.0, ATI 9600, NVidia 6600 or better