Minimum:
OS: Windows 8.1 64 Bit, Windows 8 64 Bit, Windows 7 64 Bit Service Pack 1, Windows Vista 64 Bit Service Pack 2* (*NVIDIA video card recommended if running Vista OS)
Processor: Intel Core 2 Quad CPU Q6600 @ 2.40GHz (4 CPUs) / AMD Phenom 9850 Quad-Core Processor (4 CPUs) @ 2.5GHz
Memory: 4 GB RAM
Graphics: NVIDIA 9800 GT 1GB / AMD HD 4870 1GB (DX 10, 10.1, 11)
Hard Drive: 65 GB available space
Sound Card: 100% DirectX 10 compatible

Recommended:
OS: Windows 8.1 64 Bit, Windows 8 64 Bit, Windows 7 64 Bit Service Pack 1
Processor: Intel Core i5 3470 @ 3.2GHz (4 CPUs) / AMD X8 FX-8350 @ 4GHz (8 CPUs)
Memory: 8 GB RAM
Graphics: NVIDIA GTX 660 2GB / AMD HD 7870 2GB
Hard Drive: 65 GB available space
Sound Card: 100% DirectX 10 compatible