keyboard malfunctioning - what to do?

Why should I clean my keyboard?
Because dirt, dust, hair, cookie crumbs, etc, can build up causing the keyboard to malfunction.

How to clean the keybord: Some people clean their keyboard by turning it upside down and shaking it to let whatever debris has lodged itself under the keys fall out onto the desktop. A better way to do this is to blow the keyboard out using compressed air. Compressed air is pressurized air inside a can that has an optional tube attached to the side (usually with tape) kind of like WD-40 (don't use that on your keyboard, though)... All you need to do is turn the keyboard upside down then aim the air between the keys and blow away all of the dust and debris that has gathered there. You can use a vacuum cleaner, but be careful that you don't suck up any of your keys!

Another reason to clean your keyboard is to ward off germs especially if you have more than 1 user on a particular PC. You need to turn the system off first, then spray a disinfectant on a cloth and wipe the keyboard and allow to dry. Don't spray anything directly on your keyboard (or any other part of your system, either)...