recommended system requirement: 

Operating System:  Windows 7 (64 Bit)

CPU: Intel Core i5 3470 @ 3.2GHz, AMD X8 FX-8350 @ 4GHz

RAM: 8 GB

storage: 65 GB

graphics card: NVIDIA GTX 660 2GB, AMD HD 7870 2GB

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minimal system requirements:

Operating System:  Windows Vista (64 Bit)

CPU: Intel Core 2 Quad CPU Q6600 @ 2.40GHz, AMD Phenom 9850 Quad-Core @ 2.5GHz

RAM: 4 GB

storage: 65 GB

graphics card: NVIDIA 9800 GT 1GB, AMD HD 4870 1GB