In order for you to play Patrician III on Windows with minimal graphics settings, your computer must meet the following requirements
OS *:
Windows XP SP2/Vista
Processor (CPU):
1.6 GHz or higher
Memory (RAM):
512 MB or higher
Graphics Card:
128 MB DirectX 9-compatible (Pixel/Vertexshader 1.1)
DirectX®:
DirectX-compatible
Hard Drive:
6.5 GB free hard drive space