it depends on what kind of a isp you have, do you use PPpOE or what? If you have generic Cox internet or RoadRunner, you dont have a DNS. Make sure that you have the newest firmware for the router. I had a friend that was having a problem similiar to the one that you are having. He reformatted his laptop and it worked fine... So I dont know, I would start off with checking on the firmware and then go from there. Good Luck.