um if the keyboard is locked then there must be a lock on the computer somewhere, the error is saying the physical key that some computers have has been used to lock the computer. just find whoever has the key and unlock it... the other method is to just pull the jumper for the lock that goes to the board... if it's your comp and you never use the lock then it might be an idea to leave the lock disabled...

another idea, if there is no lock and it's doing this then check to make sure no jumpers are in the wrong place.. if something is shorting out the lock pins then it will think the keyboard is locked.