how can i fix my keyboard?

my keyboard keeps typing the letter U on its own. its a compaq pressario 2100 series.
r.a, March 2006


done
hello i tryed to reboot three or four times but no luck please help me as when im trying to e.mail my ( at ) doesnt work so i cant e.mail no one

mushood, May 2011
try here - http://www.howtomendit.com/answers.php?id=29845

Darren, April 2006
link Click here to see other fixes for Compaq.