The minimum system requirements are as follows:

OPERATING SYSTEM: Microsoft Windows XP, Vista (admin rights required)
CPU: Intel Pentium 4 3+GHz or AMD Athlon 2.5+GHz
RAM: 1GB (Windows XP), 2GB (Windows Vista)
GRAPHICS: nVidia GeForce 6 series 6800GT / ATI 1800XT (or better)
SOUND: DirectX 9.0c compatible sound card and drivers
DVD-ROM: DVD-ROM drive
HARD DRIVE: 8GB free disk space
INPUT DEVICES: Keyboard and mouse

The recommended system requirements are as follows:

OPERATING SYSTEM: Microsoft Windows XP, Vista (admin rights required)
CPU: Intel Core 2 Duo 2.2 GHz or Athlon 64 X2 4400+
RAM: 2GB
GRAPHICS: nVidia GeForce 9800 GTX or ATI HD4800
SOUND: DirectX 9.0c compatible sound card and drivers
DVD-ROM: DVD-ROM drive
HARD DRIVE: 8GB free disk space
INPUT DEVICES: Microsoft Xbox360 Controller