*sigh* Computer troubles will happen to anyone. No matter how nice they are to the things.
If something goes wrong...
Go and play a game of Freecell, Solitaire or Hearts. Whatever is a bundled Windows game.
If that doesn't work...
Start deleting files. Well, threaten it first. Then start deleting. Begin with crap that obviously doesn't need to be there. Temp files, for example.
If your computer is still misbehaving, hit Ctrl + Alt + Del. Close any program that you don't recognise as having some importance.
Failing that, restart it.
If your computer is still being a little shit by that time, start bashing it. Fist first, then you can involve other large, heavy objects. The ground, for instance.
*grins* and if all that doesn't work, perhaps a trip to the computer shop would help...or your local Dungeon. Depending on whether it's a school computer or not.
Jo, not v. funny...