System Tray Notification Icons Not Showing?

I have been noticing a strange problem with my Win 7 64bit. It does not happen every day, maybe once a week or so.

When I boot up the system and the desktop loads, I noticed that all (6 ) of my security (AVG, ZA, SpyBot etc.) program icons in the system tray notification area (next to the clock) don't load. (Program tray .exe files are not being loaded on start-up) I get the network, power, volume icons but nothing else. I should see 6 icons for my security and other start up programs I have loaded, but they don't show. I have to reboot the system three or four times before the tray icons will show. I also have to do a defrag to fix the problem as well. The system works fine otherwise. The security programs run fine when they are loaded, so they are not the problem.

Like I said, the problem of "missing system tray icons" only happens once a week or so. YES I DO have tray notification set to ON. (That is the first place I looked) So that is not the problem. I tried logging off and back on as administrator. Did not work.

Here is a copy of the event log when it last happened:

Log Name: Application
Source: Desktop Window Manager
Date: 8/16/2012 6:50:11 PM

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