The question is clearly described in the Microsoft forums so I'll link it here. Basically, it is about getting back the "Network and Sharing" option in right click menu of the taskbar network icon instead of the new "Network and internet Settings"...
This is Vista question, but I usually get better results here. The network icon on my wife's desktop has a red X on it. I right clicked and it ran some kind of diagnostics and supposedly sent a message to MS, who I'll never hear from, I'm sure. ...
With no changes to my computer, the network icon has vanished from the notification area. ...When in settings, notification/quick actions, I am unable to turn on the Network Icon (the option is greyed out)?