Minimum Requirements:
Pentium 4 3.2 GHz (3.4 GHz for Vista)
1GB RAM (2GB for Vista)
Graphics card with 256MB of RAM support Pixel Shader 3 (PCI-Ex)
Sound Card compatible with DirectX 9.0c
10GB free hard disk space
Windows XP SP3 or Vista SP1
8x DVD Drive

Recommended Requirements:

Procesor
Intel Core 2 Duo 2.5 GHz or AMD 64 X2 2 GHz
2GB RAM (3GB for Vista)
Graphics card with 512MB of RAM support Pixel Shader 3 (PCI-Ex)
Sound Card compatible with DirectX 9.0c
10GB free hard disk space
Windows XP SP3 or Vista SP1
8x DVD Drive