Basic keyboard Tip
General Misc.

This is a Very basic tip. Many keys work in combination such as Control Alt Delete.

If all of a sudden you hit the Tab key and yoru screen switches to another screen or program altogether, this is an indication that one of your ALT keys are stuck. Use the previous tip to clean both.

So-o, if your keyboard suddenly starts doing something really odd (not just sticky key), think about what it's doing and see if it's part of a combination.