In order to run Wheelman properly, your PC MUST meet or exceed these minimum requirements:

Operating System: Windows XP (Service Pack 3) or Windows Vista (Service Pack 1)
Processor: 2.0 GHz dual-core processor (2.4 GHz dual-core processor required for Windows Vista) or better 
RAM: 2 GB Windows XP / 3 GB Windows Vista 
Video Card: 256 MB DirectX–compliant video card with Shader Model 3.0 or higher (512 MB recommended)
Sound Card: DirectX 9.0–compliant sound card 
DVD-ROM: 16x DVD-ROM drive
Drive Space: 15 GB free disk space 
Peripherals: Windows compatible keyboard / mouse, XBox 360 Controller for Windows 

Supported Video Cards at Time of Release:
NVIDIA GeForce 7800GT / 8 / 9 / GTX 260 series
ATI RADEON X1800XT / HD 2000/3000/4000 series

Laptop versions of these cards may work but are NOT supported.

NVIDIA nForce or other motherboards/soundcards containing the Dolby Digital Interactive Content Encoder required for Dolby Digital audio.