Dlink DI 514

I recently set up a wireless home network for a friend and both the host
computer (where the Dlink DI-514 is install) and one of the wireless
systems are communicating just fine. The other system shows that the signal
is strong but when I try to access the web I'm getting 404 errors. I
checked and made sure the proxy box was not ticked in Internet Explorer and
everything else appears to be just fine, but no wen access. Any clues on
what steps I could take to remedy this? Any information will be
appreciated.

J. Randy