Left 4 Dead

OS: Microsoft Windows XP / Vista / Vista64 / Windows 7 Beta
Processor: Pentium 4 3.0GHz
Memory: 1 GB
Graphics: 128 MB, Shader model 2.0, ATI 9600, NVidia 6600 or better
Hard Drive: At least 7.5 GB of free space
Sound Card: DirectX 9.0c compatible sound card