It could be 3rd party software. This post may help.
Network discovery and File sharing ...
Posted: Wed Nov 07, 2007 11:44 am Post subject: Network discovery and
File sharing are turned off in Vista, Reply with quote ...
Bob Lin, MS-MVP, MCSE & CNE
Networking, Internet, Routing, VPN Troubleshooting on
How to Setup Windows, Network, VPN & Remote Access on
"Krykino" <Krykino@discussions.microsoft.com> wrote in message
> Network discovery is turned off everytime I reboot my pc and I need to
> it manually. It is a private network, member of workgroup, I have even
> enabled the Function Discovery Provider Host and set the startup type to
> automatic, it is not a lenovo pc. But still the same issue happen.
> Is there any solution that can solve this??