Oh no!

I tried to do the map editor, a python window opened and closed within roughly a half second. Nothing happened. And I waited. And waited. Nothing.
Then I tried the "shooter" demo. It worked fine, except I couldn't fire

And after a "game over" screen, I tried to close it, but it stayed open, and my computer froze, except I could open up start and such, but I tried opening Task Manager....nothing happened. Task manager is meant to be running at all times, and why did it just break this time? I had to shut off the power box and restart the computer because it wouldn't let me do a shut-down.

I hope I can figure this out sooner or later.