This has been going on since I was running Windows 7, but every time that I start Windows (or now with Window 8 the the taskbar appears on the top of the screen. So, I move it down to the bottom of the screen and lock it. In fact, I don't even lock it now due to it being back at the top of the screen when I reboot/restart/etc or when the crashes. What could it be? A bug carried from Windows 7? Or a preference file being corrupt, because I had to delete some preference files just to run some programs correctly.