I was going around a forum and all of a sudden my down button won't work. At first i thought it was just my keyboard, but my Num 2 button couldn't work either. Then i tried my joystick and that down button wouldnt work too. Any help please?

Did you try reloading your keyboard driver?

Also - if it is wireless, change the batteries.
If it connects to a usb port - try a different usb port or use an adapter and use the PS2 port.

By reloading you mean re-installing, still deosnt work.