They should be there
Follow essexboy, by Control Panel to be sure. Anyway, if you left click the 'a' blue icon, choose to show details, will them be listed there?
Which is your Windows? 98, Me, XP?
Do you use any other antivirus in your computer?
Can you try to repair your installation?
Go to Control Panel > Add/Remove programs > avast! antivirus > Remove. Then choose Repair function in the popup window (Repair). You must be connected to the internet while repairing.
If this does not help, can you uninstall / boot / install / boot again?