Well, a fresh installation of windows solves 95% of the problems
In my case the problem was the vjoy.vxd stayed in my PC from the AWE32.
In your case it was a diferent (unknowned) problem.
Anyway, you MoBo is difent than mine... i have also a Via but a KT133a not Apollo Pro 133.
Glad you finally solved it, as you can see, you were about throw it out of the window, when you sould actually throw Windows of the Window (Funny ehehehe).
Don't believe blindly in what you hear! - Play safe! Play hard!