Whoa there, i totally misread this guys IPconfig/all...
He's running an ehternet cable connection? well then WEP keys and encryption don't apply, because WEP and WPA only apply to wireless connections.
So scratch the WEP key issue...
Yes, do try replacing the cable. Also try changing the port on the router the ethernet connection is plugged into...
If it comes down to it, you may have to replace the router + ethernet cable...
