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#11
It sounds like the firewall was corrupted. Try this.
It took me a couple of days to figure this out. I could not share folders or printers. I could also not turn on Network Discovery or File and Printer sharing. The radio buttons would revert back to OFF every time.
What I needed to do was to repair the Base Filtering Engine service. I'm guessing a virus or some bad program messed this up. I used a repair utility from ESET to do this for me.
Here it is: I receive the message that my ESET installation ended prematurely - ESET Knowledgebase
There is a ServiceRepair.exe. Running this and rebooted fixed the problem for me.