Keyboard partially disabled

My son has done something that has blocked inputs from most of the keys on our home computer. The top keys for the CD controls and the number lock and possibly some of the others work, but none of the character keys, cursor movement keys, etc. are functional. He says he was in a game site and pulled down an options menu that let him remove sticky keys and do something else he can't recall. System runs Windows Millenium, and I have rebooted system, uninstalled and reinstalled the keyboard, and tried all the links on the troubleshooter, all without success. Any suggestions?
Thanks

 

delta46, welcome to the BBS

Maybe go back to the game site and see if the options menu can be duplicated?

Click on windows key + U and see if anything has been checked in the utility manager?