Windows
OS:Â Windows XP SP3
Processor:Â 2.4 GHz Dual Core Processor
Memory:Â 2 GB(XP)/ 2 GB(Vista)
Hard Disk Space:Â 13 GB free
Video Memory:Â 256 MB
Video Card:Â NVIDIA GeForce 8500 /ATI Radeon HD 2600
Sound:Â DirectX 9.0c Compatible
Other Requirements:Â Initial installation requires one-time internet connection for Steam authentication.