Computer has always been used normally, but I do not know when the network icon to become disconnected state, and actually the network is normal.
1, press Win+r, open the "Run" window, input services.msc;
2, find the name "Routing and Remote access" service items, first select "Stop";
3, in the taskbar blank place click the right mouse button, pull out the Task Manager (or other methods to Exhale Task Manager);
4, end the "Explorer" process. When you finish the process, the desktop will be left with only wallpaper, the Start menu and the taskbar will disappear, and do not close task manager at this time.
5, in the Task Manager-"File"-"New Task", enter Explorer, click "OK", the desktop reload, when the network icon back to normal.
6. Follow steps 1th and 2nd to "start" the Routing and Remote Access service to complete the finishing touches.