No Internet and problems with cmd..

[DJ Gravy]

So, I have a sales guy who is going through the router that we sent him, I configured it my self. He can get online through the router with his desktop, but not his IBM T43.. I had him do an IP config, and he gets the

an internal error occurred, a device attached to the system is not functioning

when doing an IP Config.. When the user goes to his dads house aprox 10 mins north of him, he can get on fine.. as well as at a panera bread.. no problems..

So, why is it that he only has problems at his house??