Laptop's keyboard?
Answers:
Well, I'm not sure if this is what is wrong in your case but on some laptops, and on almost all new ones there is a button used to access certain options such as changing the brightness of the screen by just holding this button down and pressing the other button down. For example the button on my laptop is labeled as Fn and is located between Control (ctrl) and the windows button on the left side of the keyboard, when I hold it down and then press the [3] key it mutes the computer. Anyways what could be happening is that either the button is stuck or you are pressing it and then hitting the [u] key and it would type a 4 instead of a u. If this is true then try to pull the key out and re-insert it.
You turned on Num Lock press Fn + Num Lock
turn off the num lock
You should get an external keyboard in place of your laptop keyboard.
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