Windows</br>OS:Windows Vista</br>Processor:2 GHz Dual Core</br>Memory:2 GB RAM</br>Graphics:NVIDIA GeForce 8600 GT / ATI Radeon HD 2600 XT or greater</br>DirectX®:9.0</br>Hard Drive:20 GB HD space</br>Sound:DirectX Compatible</br>Other Requirements:Broadband Internet connection</br>Additional:Initial installation requires one-time internet connection for Steam authentication; software installations required (included with the game) include Steam Client, Visual C++ 2008 Redistributable, DirectX and Microsoft .NET 4.</br>