I am also having a problem with BooH. I recently bought a copy and installed it, and at the end I got a small window in the middle of the screen saying "Installation failed" or something similar. I clicked on the icon to start the game, and lo and behold, it started up. I checked the options, and all the options were just as I had set them for the original PK game.
Now I went to open a savegame file to see if my saved games were still working for the original, and they were - everything there ran with NO problems at all.
OK, now for the problem! I clicked to start a new game and selected the BooH game (this is ALL single player, btw...), and then I clicked to start on the initial stage for the expansion. The first thing I saw (after the intro video, which ran just fine!) was ALL WHITE!!! Practically ALL the background and textures etc were white. I could see some black surrounding what I assume to be a peninsula that I was on, and I "felt" my way along a connection to the "mainland". When I got there, I was soon attacked by several demons, which I easily dispatched with the painkiller weapon.
While I was "chewing them up" I could see red blood and gibs flying all around, but this was the ONLY color that I could see. I tried continuing on, but there was NO WAY that I could see where I was going. It was like trying to travel through a "reverse night" scenario!!!
Is this the way the game is supposed to start up??? Am I doing something wrong (or failing to do something I SHOULD be doing?)? Or is there a problem with my installation?
I uninstalled the entire PK game and started over from scratch. I first installed the original PK, then applied the 3 patches to get it up to 1.64, and then installed the expansion BooH. Again, the original game would start up FINE and played PERFECTLY, but when I tried to play the BooH game I just got the same old "whiteout" situation. It was like trying to play in a blinding blizzard.
Can ANYONE help me here??? PLEEEAAAASSSSEEEEEEEE!!!!!!!!!!!!!!!!!!!