Just had the same problem, I noticed in the system log of the event view that DCOM had a error an failed to start.
>DCOM got error "The service cannot be started, either because it is disabled or because it has no enabled devices associated with it. " attempting to start the service netman with arguments "" in order to run the server:
so I looked in the services list and sure enough Network Connections had been set to Disabled. Dunno how as I certainly didn't set it that way, checked the system for viruses etc and all was clean.
Anyway setting the network connections startup to Manual and a reboot fixed it.
