Let me ask some basic questions. Please bear with me.
Have you checked all your ethernet connections? At the PC and at the router. Are all your router idiot lights lit indicating all connections are active?
Finally did your ISP give your directions on how to set up your broadband connection? Did you check those all out? For example, your ipconfig output indicates that DNS is being provided by the a DNS server on the router. Some ISPs require this be overridden by specifying you enter IP addresses for their servers into TCP/IP settings. Finally, did your ISP assign you a static IP address versus having it dynamically assigned?