OS: Windows® XP
Processor: 2GHz Dual Core Processor (Intel® Core 2 Duo or AMD Athlon™ X2) or higher
Memory: 2GB System RAM or more
Graphics: 320MB Video RAM GPU w/ Shader Model 3.0 support. NVIDIA® GeForce® 8800 series or better. ATI Radeon™ HD3800 series or better
DirectX®: 9.0c
Hard Drive: 10GB
Sound: 100% DirectX® 9.0C compliant sound card or equivalent onboard sound
Co-Op Play:NVIDIA® GeForce® 8800 cards require 640MB of Video RAM. ATI Radeon™ HD3800 cards require 1GB of Video RAM

RECOMMENDED:

OS: Microsoft® Windows® 7
Processor: Any Quad Core Processor (Intel® Core i5 or AMD Phenom™ II X4) or 3.0+ Dual Core CPU
Memory: 4GB System RAM or more
Graphics: 1GB Video RAM GPU w/ Shader Model 4.0 support. NVIDIA® GeForce® GTX 400 series or better. ATI Radeon™ HD5000 series or better
DirectX®: DirectX® 11
Hard Drive: 10 GB
Sound: 100% DirectX® 9.0C compliant sound card or equivalent onboard sound