How to "repair" hidden/disappeared SysTray icons?

Where it says to restart, does the icon cache rebuild itself, or do I have to type in another command?

You 2 are priceless.

RoWin7 said:

...Back to Systray icons: I control them here:
Control Panel\All Control Panel Items\Notification Area Icons

If Windows notification "engine" is broken, the above way not work.

RolandJS said:

If Windows notification "engine" is broken, the above way not work.

...and the sky will fall? I know there's an update 2nd Tues of the month, and I know which programs are outdated, and I have a reason for that. I check Task Mger now and then to see if my A-V and firewall are running and whether there are any unknown processes running.

Naw, sky won't fall :) if Notification Icons Area is broken, there are solutions.

I hope the OP is still here. Wanna see what worked.