I got this from a google search (google great tool)I am not sure about this problem but it seems like a pretty big one as there are alot of sites with the same problem.I hope this helps you and points you to a solution.My opinion I would try what it says and should be safe also I would wait a day or two for someone else to comment on it or you may research it more.(I talked about this in another post about Windows automatic updates.Alot of people ask about this and get the response 99% of the time to "just download them".I disagree with this you might download a MS update that you really don't need and cause more problems.So to all always check what you are installing on your PC's.)
FROM GOOGLE SEARCH
"You bridged two connections or it came with SP2. It will act as a Brouter for the both connections. Tunneling should give you a hint. It will connect both networks, it caches the MAC addresses for the other "network".
You may delete or disable the bridge, no harm will be done. If you have clients on the Wireless that wish to connect into your LAN, which is going though you, they will lose access.
Go into your Network Places, connections, then right click on the bridge and click delete. Wait about a minute and it will be complete."