Nirth_90: So if I were to rebuild my old computer from 2002-2003 era it wouldn't help at all, if only that I will run XP 32bit instead of Windows 7 64-bit?
It *might* improve compatibility with some aspects of the game, but otherwise, probably not. Most likely it would just run the game slower, as a processor from that era wouldn't really compare with something newer.
Just to clarify what I said before: Outcast does not have a hardware rendering mode. The graphics in Outcast are generated by the CPU - the only task performed by the graphics card is to send the video signal to your monitor.
To add a hardware rendering mode would effectively require a complete re-write of the games code.