The typical scenario: It’s early morning and I get to the office, light up my PC, log on to Windows Vista and there there. The Avast icon has a little red no-entry icon on it.
This case happens more often than it should. Thanks to this (annoying) frequency, I managed to fix the problem. If you’re lucky, you’ll only have to restart the Avast Antivirus service by following the steps below.
Start > Computer (right click) > Manage > Services and Applications > Services > avast! Antivirus (right click) > Restart
But if that does not fix anything, you’ll have to do 2 things:
1. Repair your Avast Antivirus installation. Steps below.
Control Panel > Uninstall or Change a Program > Avast Installation > Repair
2. Restart your Avast Antivirus service by following the steps above.
That’s about it. This should do the trick for minor Avast problems.
Posted in 
Thank’s a lot… Under the “uninstall” option in the Add/remove folder there was an “update” button… and now it’s working fine … Thank’s again
Glad to know it worked for you Tomy.
thanks, you solve my problem
Yeah so I tried the first part but it doesn’t look like it worked at all. Then I tried the second portion but I could not repair it. Any suggestions?
Thanks