In order for you to play Doorways: Old Prototype on Windows with minimal graphics settings, your computer must meet the following requirements
OS *:
Windows XP, Windows Vista, Windows 7, Windows 8
Processor (CPU):
Dual core CPU @ 2GHz (Pentium D or better)
Memory (RAM):
1 GB RAM
Graphics Card:
NVIDIA 6800, ATI 1950
Storage:
150 MB available space
Sound Card:
100% DirectX 9.0c compatible Audio Device