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#21
Download the Chipset / LAN / SATA Raid driver for your motherboard, Vista 32 or 64 bit depending on which Win 7 you have installed.
GIGABYTE - Support&Download - Motherboard - Driver - GA-M61VME-S2 (rev. 1.0)
Run the .exe. Let it extract. Then manually install only the network part through the device manager, under network adapters, by pointing to the .inf in the ethernet folder.
If that doesn't help, I'd check your router is not denying internet access (as opposed to intranet, which seems to be working since you see other pc.) Turn on the logs if you gotta. Basically, ensure there's no filter against your machine by either direct exclusion or that it only allows registered machines by mac address to access the net.
Try disabling the dns client service and rebooting. Absolutely make sure that there is no Bonjour service present in services or program files or any mdnsresponder.exe in task manager. If there is let us know so we can help ya fix it. Use Malwarebytes to scan your system.
Can you successfully ping ip addresses, like Google's? Try from command prompt:
ping 74.125.127.100