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First can we check if the problem is with connection of the PC to the router, or the router to the modem (or STB)?
With the PC connected by ethernet to the router, can you browse to the router's admin pages, usually 192.168.1.1? If you get the admin pages, or at least a log on screen we know that part is correct.
Not wishing to teach you to suck eggs, please confirm that when using the router, the only connection coming from the modem is the ethernet serving the router, no other USB or ethernet cables are connected. You must power off and on every time you swap cables.
Do you currently have a modem, or Set Top Box for your broadband, and how do you currently connect, USB or Ethernet?