sticky keys keep going off?

I work at a computer shop and I received a laptop, it was a old man and he said that every time he turns on his computer it keeps beeping, so I turn it on and as soon as it says 'welcome to windows' I hear the sticky key go off, and the stick key prompt comes on telling me how to change it etc. SO i go in there uncheck the boxes and it seems to work. ..then when I restart the computer, It turns on again doing the same thing any ideas?

Bleh ,sorry I forgot this was a windows 7 only forums do the same people have a windows XP forums? =[ im extremely sorry, is there one for XP?

This could be caused by a stuck key on the keyboard.