http://store.steampowered.com/app/91310/

Minimum:
OS: Windows XP
Processor: Core2Duo 2.66 GHz
Memory: 1 GB RAM
Graphics: ATI 2600XT 512MB VRAM (GeForce 8600GT)
DirectX®: DirectX 9.0C
Hard Drive: 7 GB available hard drive space
Other: keyboard, mouse

Recommended
OS: Windows 7
Processor: Core2Duo 2.66 GHz
Memory: 4 GB RAM
Graphics: GeForce 9600 (1GB)
DirectX®: DirectX 9.0C
Hard Drive: 7 GB available hard drive space
Other: keyboard, mouse