For some reason the zero, two and four keys have stopped working on my Acer travelmate 5742 number pad. The number keys at the top of the keyboard work perfectly, but I very rarely use them due to nerve damage in my left hand,that makes it easier to use the number pad as a game control rather than the usual W,A,S,D. I've tried uninstalling the keyboard driver and rebooting but it still hasn't worked, so any help will be appreciated thank you.