Minimum system requirements:

CPU: P4 2.6GHz (Athlon 3000+)
RAM: 1Gb
Video: GeForce 6200 (Radeon 9600) 128Mb
Windows XP/sp1
DirectX 9.0c
DVD

Recommended system requirements:

Windows XP/sp1 (Windows Vista)
CPU: Core 2 Duo 2.33GHz (Athlon X2 5000+)
RAM: 2Gb
Video: GeForce FX 8600 (Radeon HD2600) 256Mb

Multiplayer: Recommended requirements + Internet connection 256 kbit/s