WindowsOS: Windows Vista - Service Pack 1 / Windows XP - Service Pack 3Processor: Intel Core 2 Duo 1.8GHz, AMD Athlon X2 64 2.4GHzMemory: 1.5GB XP / 1.5GB VistaGraphics: 256MB Nvidia 7900 / 256MB ATI X1900DirectX Version: DirectX 9.0c Compliant CardHard Drive: 16GB of Hard Disc SpaceSound Card: 5.1 Channel Audio CardOther Requirements: Initial activation requires internet connection; Online play requires log-in to Games For Windows - Live and Rockstar Games Social Club (13+ to register); software installations required including Adobe Flash, DirectX, Microsoft’s .NET Framework 3.0, Games For Windows - LIVE, and Internet Explorer.