Five and six not working on keyboard hp notebook

My "m" key doesn't work on my laptop and what I do is copy the "m" and paste it whenever I need it. It's a bit of hassle but it works..

I wonder if you could substitute a key that you don't really use that often for another key that's not working.
 
When did you buy the laptop? is it in warranty? I would call and ask. if your not then get a new keyboard... i cant see them being to expensive off of ebay. by keyboard i actually mean a replacement to the one thats broken, not an external keyboard.