Minimum: OS:Microsoft® Windows Vista®/XP®/Windows® 7 Processor: 2.3 GHz CPU with SSE2 Memory: 1 GB RAM (XP), 2 GB RAM (Vista®/Windows® 7) Graphics: 256 MB DirectX® 9.0c shader model 2b compatible GPU DirectX®: DirectX® 9.0c Hard Drive: 21 GB free space