Type troubleshoot in the start menu search and press enter key.
In the Systems Icons area, ensure that the Network checkbox is selected.
In the Properties dialog box, click the Notification Area tab.
Right click the Windows button ( Start Menu), and select Properties.
If you are using windows 7 or 8.1 try the following below. Make sure Network or Wireless is set to enabled. Again go Back and now click on “ Select which icons appear on the taskbar.“ And Make sure Network or Wireless is set to enable.
Scroll down to the bottom then under Notification area click on “ Turn system icons on or off.“.