Let me guess...you're running your desktop resolution at 32-bit color, right? I had the same problem, and so I looked up the error on thei website. It happens while you're generating textures, and the Voodoo3 isn't capable of generating 32-bit textures in games, but you can run at 32-bit desktop color. Switch it to 16-bit color while you're installing, then switch back after you're done. That should do the trick.