@dafyre said in NIC issue windows 7:

In the Network Adapter options, disable anything that says power managment.

There's a couple of power management options on the NIC, but IIRC there's some bus-related power management options in the power-profiles. I've seen the NIC-related options take an interface off-line, but where you're saying that it's disappearing completely, I'd be more inclined to look at PCI or chipset drivers and settings.