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04 Oct 2012  

Windows 7 Pro X64 SP1

It'd be helpful if you gave us some information about the PC.

It sounds like something has gotten messed up with your NIC (network interface controller). I suppose that there's a slight chance that limited PCI-E (PCI Express) resources could disable the NIC if you switched from onboard graphics to a discrete card, but you didn't even specify whether that is what you did.

If you go into Device manager, what shows up for the network controller?
My System SpecsSystem Spec