Operating Systems: Windows XP (with Service Pack 2) or Windows Vista

Minimum System Requirements:
CPU: Pentium 4 2.4GHz Single Core processor
System RAM: 1GB
Video Card: Direct X 9.0c compliant video card with 128MB RAM (NVIDIA 6600 or better/ATI X1300 or better, excluding ATI X1550).
Sound Card: 100% direct X 9.0c compatible sound card
Hard disk space: 8GB free space

Recommended System Requirements:
CPU: Intel Core 2 Duo processor
System RAM: 2GB
DX9 GPU: Direct X 9.0c compliant video card with 512MB RAM (NVIDIA GeForce 7900 GT or better)
DX10 GPU: NVIDIA GeForce 8600 or better
Sound Card: Sound Blaster X-Fi series (Optimized for use with Creative Labs EAX Advanced HD 4.0 or EAX Advanced HD 5.0 compatible sound cards)

Important Note: Game requires Internet connection for activation.

Link

Enjoy