Windows
OS: Windows XP SP3
Processor: 2.4 GHz Dual Core Processor
Memory: 2 GB(XP)/ 2 GB(Vista)
Hard Disk Space: 13 GB free
Video Memory: 256 MB
Video Card: NVIDIA GeForce 8500 /ATI Radeon HD 2600
Sound: DirectX 9.0c Compatible
Other Requirements:Initial installation requires one-time internet connection for Steam authentication; software installations required (included with the game) include Steam Client, DirectX 9, Microsoft .NET 4 Framework, Visual C++ Redistributable 2005, Visual C++ Redistributable 2008, Visual C++ Redistributable 2010, and AMD CPU Drivers (XP Only/AMD Only)