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When transferring files between computers on my home network, after about 200-300MB, the desktop completely loses connectivity. The only thing that solves the problem is to disable then re-enable the local network adapter. This problem only came up about a month ago when I upgraded both systems to Win7 from XP64 and Vista 64.

So should I take it to mean that the network circuitry on my motherboard is going, and that I should switch to a NIC card? This happens with two different routers, over wired or wireless connections.

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I'd first try updating the drivers for your motherboard before fully replacing it. You could also try a cheap PCI NIC instead.

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