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12 Oct 2010  

Systems 1 and 2: Windows 7 Enterprise x64, Win 8 Developer

Welcome to SF, rolfjk.

If this problem was sporadically happening, it indeed sounds like a hardware failure. This in light of the fact your other PCs work on that Ethernet cable and router. You could try swapping cards as a test with another pc. If that doesn't work, you will need to buy a new nic.
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