Ghostly ethernet adaptor

My home wireless network (previously stable for over a year) keeps dropping the connection to the powerbook after 10-15 seconds. When I opened the network bit of system preferences it told me that a new 'ethernet adaptor (en3)' had been detected, but I don't have anything new plugged in. A box appeared that said I should verify the adaptor settings then press OK, but unless I pressed OK I could do nothing else. I pressed it. Rebooting laptop and router does not help and the PCs in the house connect to the router OK both via ethernet and wireless.
The only recent changes are that I have recently joined .mac and the only new software is backup 3.
I don't seem to be able to remove the ethernet (en3) and can only presume that something has gone wrong for it to be detected in the first place.
Any suggestions?
Mike

I'm going to guess that you are running Parallels? (If not I have no idea)
If you are they are basically clones of your Ethernet port. En3 is the port windows sees and uses, and En2 is a bridge between that port and the physical port in your computer that OS X uses.
Interesting side effect of it is that Parallels doesn't use the same MAC address as OS X. So if for some reason you MAC is blocked on a network, you can still access the same net work if you boot windows in Parallels. I've been on bandwidth restricted networks and had my MAC address locked before and switching to windows in Parallels always give me access back. Its also kind of amusing because each boot or parallels gives you a new MAC address.

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