[Rob]

If you have been playing with settings on the router, do a reset to factory. Similarly make sure that the network connection on your computer is set to auto, and also in Internet Explorer Tools > Options > Connections, that is also auto. Now power everything modem, router, PC off. Disconnect any USB connection from the modem you may have been using.

Plug ethernet between modem and the routers WAN (internet) port. Plug ethernet between the routers LAN (network side) port and computer. Power on modem, let settle, then router let settle, then PC.