I can connect to a wireless net work with an "excellent" signal, but it will not let me get on the internet. If I plug the ethernet cable into the router, then it lets me get online. I think that something on the laptop is not set up right, but I don't know what it could be. My room-mate is able to get onto the internet with a connection to the same wireless network/router. Please help me, I don't know anything about this stuff. Thanks