Also, you may try this…
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Check is avast! running at all - check your taskmanager, and see if you can find avast! processes in there.
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If it is not up and running, try repairing avast! (control panel - add/remove - avast! - change/repair). Note: You must be connected to the internet while performing avast! repair.
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If it is up and running and you still don’t see your icons, give RejZor’s AEC (avast! External Control) a try. Search these forums for a link.
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If all of that fails, then uninstall avast! using the uninstall utility from the website, reboot and reinstall it from the scratch.
Cheers !
Edit: Also make sure your icons are not set to auto-hide in the taskbar properties (Windows).
Also, take a look in here:
http://forum.avast.com/index.php?topic=10569.0
Another thread with same problem… see if any of those things apply to you…