I have the same problem with the release version of windows 7. The actual problem is I renamed my own machine, and my old machine name still shows up in network discovery, even if I restart the service it is still there. I may have to go digging around in the registry.
The also is a related problem that my machine cannot sleep (suspend S3) automatically as there is always a file sharing connection open to itself.
An active remote client has recently sent requests to this machine.