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A solution to "Unknown network - no connection to Inter
I found a solution to the problem "Unknown network - no connection to Internet". For me, this problem seemed to develop after I had a problem getting the drivers for both my printers set up correctly. I don't know if that was related to the cause, but after that every time I started Windows 7 I could not connect to the internet. The 'troubleshooter' couldn't find or fix the problem. I could fix it by disabling, then re-enabling the network adapter through the control panel. However, that only fixed the problem until the next time I started Windows.
What permanently solved the problem:
1. Go to Device Manager
2. Find your ethernet network adapter, then right-click on it. Select the option "Uninstall"; this is different from the option disable. You will get a message asking 'are you sure?' click yes, you are sure.
3. Actually, that's it, you are fixed. After doing the above, your network card is listed as unknown device. Don't worry. Restart Windows, it will recognize your network card as a new device and do a fresh install of the correct driver.
Anyway, that worked for me. It is actually an old Windows trick to get the system to fix itself, even when it otherwise tells you the driver is working ok.
This worked on my system; your mileage may vary. I have a Sony Vaio RC-110G, intel dual core processor, 2 GB ram, running Windows 7 RTM Ultimate edition, none of which should really matter. The network 'card' is onboard Intel Pro/1000 PM network adapter. I was going to search for a new driver at Intel's site when the above trick dawned on my crusty old brain.