It COULD be a bsod. I just looked in the event log and found something maybe thisll help me out
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 upnphost with arguments "" in order to run the server:
For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.