Minimum system requirements:
Operating System: Microsoft Windows Vista (Windows XP does not support)
Processor: Dual-core CPU (Athlon 64 X2 4200 / 3GHz Pentium D 3GHz)
Memory: 2GB system memory
HDD: 10GB of available hard disk space
Graphics: DX10-compatible graphics card, 256 MB RAM (NVIDIA GeForce 8800 series / ATI Radeon HD 2600 Pro)
Sound: 100% compatible sound card DirectX 10
DirectX: Microsoft DirectX 10

Recommended system requirements:
Operating System: Microsoft Windows Vista SP1 or Windows 7
Processor: Intel Core 2 Duo 2.6 GHz or AMD’s Phenom X3 2.4GHz or similar
Memory: 3GB system memory
HDD: 10GB of available hard disk space
Graphics: DX10-compatible graphics card with 512 MB of memory (Nvidia GeForce GTS250 Series / ATI Radeon HD 5750 series)
Sound: 100% compatible with DirectX 10 Dolby Digital 5.1 sound card
DirectX: Microsoft’s DirectX 10.1

Demo download

http://www.worthdownloading.com/getfile.php?gid=4296&id=21397&lid=17