This is an old story, and I'm pretty sure most of you have heard it, but it's late and I've got nothing else tonight so I'm going with it.
I once (during college) had a dream that my computer was demon-possessed. The demon had taken control of the screen and wouldn't let me access any of my programs or documents, spewing a bunch of obnoxious high-pitched gibberish . It wasn't doing anything particularly evil or obscene, but it certainly had my compy in its satanic clutches. So I hit CTRL+ALT+DEL and the Task Manager window popped up. On the list of currently running applications, I found "DEMON." I clicked on DEMON and then clicked the "End Task" button. Problem solved.