Kath, don't know what your laptop is like but for me I click the Fn key and there is one called NmLk.. that will fix it.. it is just your num lock is on.
That's what i had done when I first got my laptop, I thought i'd broken it but then my dad's friend told me to press Num Lock and it went back to normal (:
•♥Celine: Through The Eyes Of The World - 02/18/2010♥•