Minimum: Windows 2000/XP, 2.0 GHz Processor, 256 MB of RAM, 128 MB ATI 9000 or higher or 128 MB GeForce 3 or higher (except GeForce 4 MX), DirectX 8.1 or higher compatible sound card, DirectX 9.0 (included with download), 5.5 GB Minimum Hard Drive Space, NVIDIA nForce or other motherboards / soundcards containing the Dolby Digital Interactive Content Encoder required for Dolby Digital audio, Windows-compatible keyboard and mouse Recommended:Windows 2000/XP, 3.4 GHz Processor, 512 MB of RAM, 256 MB GeForce FX 5600 or higher or ATI Radeon 9600 or higher, Sound Blaster Audigy 2 series sound card or higher, Game Pad