If you log into your router by opening a web page and going to "192.168.0.1" log in, under "Firewall" turn OFF "IP Flood Detection" and "Firewall" this will fix that and make it like lightning.
I had the exact same problem -- Windows 7 Troubleshooter kept telling me there was DNS look-up failure.
This suggestion appears to have fixed the problem.
I had the same issue and Win7 troubleshooter kept either telling me there was no problem or that there was an error reaching the DNS server.
Turning the "IP Flood Detection" worked like a charm for me. I am currently roaring down the information highway
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