Uhhh... I had a similar problem a long time ago.
This might sound odd, but how many connections are there from the modem/router into that computer?
The person who set my network up ran a cable from the modem into my machine (USB), and then an ethernet (to USB adapter). I have no idea why. At the time I had no knowledge of networks. Odd as he works for the airforce as a tech, and i'm still not even A+ :O
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