Network Adapter Problem

I have a NVIDIA nForce 10/100 Mpbs Ethernet Adapter. It was working for about a year, but one day it just quit on me. My computer and router are recognizing each other because there is a green flashing light on it, however I have no internet connection. It tells me that it is an "Unidentified Network" with no internet connection. When I run the Microsoft troubleshooter, I get the message "Local Area Connection doesn't have a valid IP configuration". I have even tried stopping the Bonjour DNS service responder, and that has not helped. I know this is not a hardware issue, because the lights are flashing and the computer recognizes an ethernet connection. I have a 2Wire router/modem.

CAN SOMEONE PLEASE HELP ME? I really need internet.

Hi please post an ipconfig /all for us to review.