I replaced the keyboard on my gateway MT3422 and now it appears the number lock is engaged, even though there is no number lock on the keyboard. The u,I,o,j,k,l, & m keys type numbers instead of letters unless I hold down the Fn key. Does anyone have a solution for this problem?

Is this your keyboard:
http://myweb.dal.ca/yaox/Keys/GATEWAY/KEYBOARDS/GATEWAY%20MT6000.JPG

The Num lock is located on the top row to the RIGHT of the F12 key and LEFT of the Pause/Break.
It's labelled as SCROLL, with a number 1 in a padlock.