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I have windows vista installed on my computer but whenever I try to access Network discovery it last for several time and then turned off abruptly and because of this reason I prefer to take back up of my system.
But I wanted to find out the reason behind it.
please help.
I would suspect that Vista's operation of those functions is being interfered with. The primary suspect would be your McAfee software as it is trying to control your system's safety functions. I refuse to use any of McAfee's software, so cannot advise you on what to look for in it, but a positive test would be to uninstall the software and see if you are able to regain control of the firewall and network discovery settings.
It's really simple. This has nothing to do with the domain unless there is a policy set to disable this which I think would be really silly to do so.
In the Network and Sharing Center you will see Network Discovery and File Sharing. Simply turn them on!
Go to administrative tools > firewall with advanced security.
Click "inbound rules" then on the right "filter by profile" > "filter by private profile"
Next find all the "Network discovery ..." items. You will see that the SSDP-In and the UPnP-In are not enabled.
When you enable these; network discovery will automatically turn back on again. Unfortunatly after a reset or a reboot, they turn back off again. When you double-click these items it says "this is a predefined rule and some of its properties cannot be modified" I am not sure this is why it keeps turning off.
If someone knows to to make the "enabled" option permanent I would be much obliged.