Hello,  I have several computers with GameEx on it. One of these old computers goes into a black screen when I try to run GameEx on it. The mouse dissapears for a few seconds while it's black and then pops into view. I can't get out of the black screen until the mouse shows up, then I just press the ESC key and I return to the desktop. I just installed GameEx on it. The Operating System is Windows XP. The computer is old, but still works. What could be the problem?