Minimum:

OS: Windows Vista, Windows 7, Windows 8
Processor: Intel Core 2 Duo @ 2.4Ghz or AMD Athlon X2 5400+
Memory: 2 GB RAM
Hard Disk Space: 15 GB HD space
Video Card: Intel HD Graphics 3000 / AMD HD2600 / NVIDIA Geforce 8600
DirectX®: 11
Sound: Direct X compatible soundcard

Recommended:

OS: Windows Vista 64 Bit, Windows 7 64 Bit, Windows 8 64 bit
Processor: Intel Core i7/AMD Bulldozer
Memory: 4 GB RAM
Hard Disk Space: 15 GB HD space
Video Card: Intel Graphics 5200 / AMD HD6000 Series / Nvidia GTX500 Series minimum 1GB RAM
DirectX®: 11
Sound: Direct X compatible soundcard