I just installed Unreal Gold on my laptop (sort of, my disc drive isn't working so I just put the Unreal Gold folder onto a USB drive and then transferred it onto my laptop), and for the most part it works as it should. However, after a little bit, the viewpoint starts slowly panning downwards until I'm completely facing the floor. No matter what I do, it constantly is doing this pan, being noticeable when I stop moving the mouse. Is there a way to fix this problem?