Windows
OS: Windows XP SP3 Processor: 2.4 GHz Dual Core Processor Memory: 2048 MB RAM Graphics: NVIDIA GeForce 8500 / ATI Radeon HD 2600 DirectX: Version 9.0 Storage: 13 GB available space Sound Card: DirectX 9 Compliant Additional Notes: Other Requirements & Supports: 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). Windows Imaging Component (Windows XP 64-Bit only)