In order for you to play Comanche 4 on Windows with minimal graphics settings, your computer must meet the following requirements
OS *:
Windows 2000, XP & Vista
Processor (CPU):
Pentium II 450MHz or better
Memory (RAM):
128MB minimum
Graphics Card:
Direct3D w/ 16MB or better
DirectX®:
DirectX version 8.0 or higher (included)
Hard Drive:
250MB Free
Sound:
DirectX-compliant