By not starting in the first place this option is disabled by default
Left click on the avast 'a' icon, click the Details... >> button if shown, select the - Standard Shield > Customize > Advanced - 'Show detailed info on performed actions' this option is off by default, so it would appear you have been tweaking avast without knowing the effect it will have. This function is also on the Web Shield and Internet Mail providers so you should also check those.
