Hi…
One of the latest Avast updates is blocking legit, widely used AdwCleaner program: http://general-changelog-team.fr/fr/downloads/finish/20-outils-de-xplode/2-adwcleaner
Please get it corrected.
Thanks 
Send the ADWCleaner.exe to virus@avast.com Subject:false positive
And it will be cured soon.
Done.
Thanks