Firstly 'Deletion' isn't really a good first option (you have none left), 'first do no harm' don't delete, send virus to the chest and investigate.
These advanced 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
You only have a limited option in the Home (free) version, to send the infected file to the virus Chest (silent mode, with general answer no, see below).
My own feeling on this is you should use the default interactive action. This way you know exactly what is going on with your system. If you are getting so many warnings, that you want to automate this process, I believe you should review your security practice - filter emails at source, delete from server rather than download them, review the sites they visit, etc.
See the avast help file, Resident Protection: Standard Shield Provider Settings - "Advanced" Page.
Click on
Standard Shield and then on
Customize.
Go to
Advanced tab and select
Silent Mode and the General answer
No.
Leave the file in the chest for a few weeks (it can do no harm from there) to ensure no adverse effect from being moved to the chest. Then scan the file again in the chest to ensure it is still detected as infected and if so delete it from the chest.
