The Minimum System Requirements:

Operating System: Windows XP/Vista/7
Processor: Intel Pentium 4 2.4Ghz
Memory: 1 GB
Hard Drive: 1.6 GB Free
Video Card (graphics): GeForce 6600 or Radeon X600 GPU with 128MB GRAM Shader Model 2 Required
DirectX: DirectX 9.0c

The Recommended Requirements:

Operating System: Windows XP/Vista/7
Processor: Intel Pentium 3.0GHz or Dual Core 2.4Ghz, or higher
Memory: 2 GB or higher
Hard Drive: 1.6 GB Free
Video Card (graphics): GeForce 7600GT or Radeon HD 2900 GPU, with 256MB or higher Shader Model 3
DirectX: DirectX 9.0c