So does this also happen if you move the mouse cursor around in, say, Defrag or MSD? These are in a different graphic mode than your typical game. In System Shock, have you tried different video modes? Does it happen only in 640x480, or in all resolutions? Do you have a joystick? If so, some games …

I know the problem goes away when you switch graphics cards, but, just to rule the mouse out-- Have you tried remming out your mouse driver and playing System Shock with keyboard only? Have you tried a different mouse driver? Do you have an idea if this happens in just a few DOS games or in all? …

I've been searching around for a while about this but I can't seem to find anyone with a similar issue (maybe I've been searching poorly). I'll try to cut to the chase here, Every time I load up a game in DOS (from Windows 98 shortcut that reboots into dos for gaming); if it has mouse control, when …