This should by default open the General section. Within the Avast UI disable the following options as follows:

Right-click on the Avast icon and select Open Avast UI. If not visible click on the arrow head to the left of the notification area to reveal hidden icons. This is to the right of the Taskbar at the bottom right of the screen. Navigate to the Avast icon in the Windows notification area. Using the Avast User Interface (Avast UI) you can disable options such as: insert note into out going mail audio notices social networking pop-ups and others.