Keyboard letter "l" not working

Fist rule out hardware by logging into another account and seeing if it works. If it does not then download the widget called "Option/Alt" at:
http://www.versiontracker.com/dyn/moreinfo/macosx/29263&vid=288618
It will show if the key is being recognized. It will present a keyboard display that you can see the I key blacken if it is recognized. You can also click this virtual keyboard to see if you can type a key that way or if there is something in software not allowing a particular letter to be typed.

so my letter H on keyboard does not work unless i use tHe sHift key. I downloaded tHat option alt widget but it still does not work. any Help???

Mine is the case, except it deals with the "Z" key. Only works when I press the SHIFT key. Very annoying.