I installed the Mohha Spearhead Demo latley. And it did not work. But then I found a post here about this problem. I went to this link http://www.scitechsoft.com/products/enterprise/gld_home.html and got this file. After that the game actually opened up and music started to play, but the graphics are not visible. It just shows a pure black screen.
What kind of graphics card are you using? Is it within minimum specs?
Do you have the latest drivers for it?
I do not know, how do I find out.