It refuses to install it unless you do it in a certain way. I got much help myself, you can follow the instructions posted here :
Hi, I have the problem that is requesting some missing .dll, I tried everything suggested, like reinstalling the game several times.
It seems that it stops right on the "PhyxNvidia" because my driver had a newer version so it refuses to install that old one, that may be causing the problems, but I dont know how to make it run.
What is that "silent mode" you talk about? maybe I can look into that if its related to the "PhyxNvidia" soemehow.