Those are the minimum reqs
Minimum System Requirements
OS: WINDOWS VISTA (SERVICE PACK 2) 32-BIT
PROCESSOR: 2 GHZ DUAL CORE (CORE 2 DUO 2.4 GHZ OR ATHLON X2 2.7 GHZ)
MEMORY: 2 GB
HARD DRIVE: 20 GB
GRAPHICS CARD (AMD): DIRECTX 10.1 COMPATIBLE WITH 512 MB RAM (ATI RADEON 3000, 4000, 5000 OR 6000 SERIES, WITH ATI RADEON 3870 OR HIGHER PERFORMANCE)
GRAPHICS CARD (NVIDIA): DIRECTX 10.0 COMPATIBLE WITH 512 MB RAM (NVIDIA GEFORCE 8, 9, 200, 300, 400 OR 500 SERIES WITH NVIDIA GEFORCE 8800 GT OR HIGHER PERFORMANCE)
SOUND CARD: DIRECTX COMPATIBLE
KEYBOARD AND MOUSE
DVD ROM DRIVE