I'm stuck at the lever puzzle on the book shelf in mannanans study. How the hell do you figure this out?

I've installed the QfG2 remake from this website. However when I go to play it, the screen flickers a few times and then a message pops up and says that theres a problem with the graphics. More specifically that it "Can not set video mode." I have a Windows XP and I know I have the require...