Hello Buddha,
This tutorial may be able to help you fix this problem.
Notification Area - System Icons
Hope this helps,
Shawn
Quote: Originally Posted by
Buddha 
My network activity icon suddenly vanished from the notification area. So
did the Volume Control. R-Clicking on the Taskbar and going to
properties/notification area shows check boxes for both, but both are grayed
out. No changes have been made to the system. At reboot, the 2 items were
just gone.
Any ideas?
Buddha