Keypad -> http://en.wikipedia.org/wiki/Keypad
Since you mentioned a mouse I have to guess you meant the touchpad. On some models (there is no standard here) the touchpad can be disabled in many places (BIOS, an utility or a FnKey) so you get to know your machine to turn it back on.
In my laptop I have it set to disable the touchpad when I use a mouse.
keypad is not working, could it be turned off, thanks