As David said, only in Professional version (see picture here: http://forum.avast.com/index.php?topic=13315.msg112285#msg112285).
In Home version you can check the option “Don’t show this window again” as soon as the first virus warning appears, and click on “No action” button. This way, nothing will be done and you will be presented the results at the end (and you can perform actions from there). 