I've just had to rip AH from my system and reinstall it because I tried 32 bit color mode in AH. You don't have to suffer the same fate.
I know, I know, the Voodoo3 doesn't support 32 bit color, but I wanted to see what happens, nonetheless. I got a diagnal line, two colors, and a strange tornado-shaped graphic. If you can Alt-F4 or Ctrl-Alt-Delete, do so, otherwise you may have to restart your computer up to 4 times (or go to windows safe mode) in order to get windows working again properly.
Simply reinstalling AH does not fix the problem. If you enter AH again, the weird colors and lockup will be there again. You need to remove the offending file(s) and reinstall AH from scratch.
This procedure isn't too bad for a propeller-head computer junkie, but for a casual user it would be nasty. I will post some suggested changes in Graphics bugs section.
So.... If your video card doesn't support 32 bit color in 3D games, don't try it.