OS: Windows XP (SP3), Windows Vista (SP2), Windows 7 (SP1), Windows 8, or Windows 8.1 PROCESSOR: 1.8 GHz Intel Core 2 Duo, AMD Athlon 64 Dual-Core 4000+ or equivalent (For computers using built-in graphics chipsets, the game requires 2.0 GHz Intel Core 2 Duo, 2.0 GHz AMD Turion 64 X2 TL-62 or equivalent) MEMORY: At least 2 GB RAM HARD DRIVE: At least 9 GB of free space with at least 1 GB additional space for custom content and saved games VIDEO CARD: 128 MB of Video RAM and support for Pixel Shader 3.0. Supported Video Cards: NVIDIA GeForce 6600 or better, ATI Radeon X1300 or better, Intel GMA X4500 or better SOUND CARD: DirectX 9.0c Compatible DIRECTX: DirectX 9.0c compatible