In the System Icons section, tick the check box for Clock, Volume, Network or Power components to display the corresponding icons in system tray.
In the Taskbar and Start Menu Properties dialog window that appears, click on Notification Area tab if it’s not already there. To fix and restore the missing system icons in Windows Vista notification area or system tray, right click on the blank or empty space on the system tray itself, or on the Taskbar, and select Properties. If any of these system icons are missing or disappearing from the notification system tray in Windows system, users can easily make these invisible hidden icons to unhide and appear visible again in the Windows Taskbar’s notification area.
In Windows notification area (previously known as system tray or simply systray) at the end of the Taskbar, there are always a few system icons that show statuses and allow adjustment control of various system components, such as clock, network connections, sound volume and battery power.
