Win 7 RC and Broadcom NIC

I have installed Win 7 RC on a system with a Broadcom netXtreme Gigabit Ethernet Adapter. The driver is the one supplied with the RC distro. The adapter appears to be working properly as the activity lights on my Router and Adapter are indicating activity. The problem is that windows reports that no Ethernet cable is plugged in. I have tried updating drivers from the manufacturer and resetting my network hardware to no avail. I am stumped. Any suggestions?

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