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ok i had doom 3 and quake 4 on this computer both running flawlessly, and ever since i downloaded and installed Quake 2 Evolved ( a mod for q2 that runs it on doom 3 engine i believe ) no doom 3 engine game works. Quake 4 will show the splash screen, and the screen will go black, but then it just goes back to windows, and doom 3 doesn't give me anything at all. These games were just working fine a couple of hours ago! i tried restarting but that didn't do anything, is there anything you guys can recommend??