On his computer he gets an error message: connection time out : internet connection time out has expired. COntinue to wait choices are yes or no.
This error is usually associated with your email program (which we still haven't confirmed).
It would also be unusual to get it if no mail activity is going on, is there an auto (timed) check for email being done without his intervention?
However, since you have said he is using office 2002, he may even be using MS Outlook?
Can he send or receive email at all, without these messages (must importantly we need to know his email program)?
Does he have a firewall (if so what one) and does it allow ashMaiSv.exe access to the internet?