What version of avast do you have Home or Pro ?
In the pro version you can set up automatic actions to take on detection.
These automated options are only available in the Pro version. This is a limitation of the Home (free) version that it has interactive input requirement, there have to be differences in the Home/Pro version and this is one of them, the programmers have to eat
If home I guess you are using the ashQuick.exe and windows task scheduler as a work around.
In the Home version you can check the option "Don't show this window again" when the first virus warning appears, select the "No action" button. This way, no action will be taken and you will given the results at the end of the scan (and you can perform actions from there). Over time this will become less of an issue, as the resident, on-access scanners are designed to intercept infection before it gets into your system. So if you are getting these on a regular basis I would suggest you review your security.
There was one suggestion to place something like the eicar test virus at the start of the first drive to be scanned in a file like ~a-eicar.com that should soon be detected and you can do the option "Don't show this window again" when the first virus warning appears, select the "No action" button.
