How to fix missing Avast icon from system tray

This is a common problem with Avast Free Antivirus. Honestly I don't know the reason for this behavior, but the easiest solution is to repair Avast installation through Add/Remove program.

1. Open Control Panel
2. Click on Add or Remove Programs
3. Locate Avast and select repair

If this doesn't help, maybe you can try to reinstall Avast.