If this happens again download the latest full clean file of AIS or Premier of your choice to keep on your HD, and also download the Avast Uninstall Utility Tool https://www.avast.com/uninstall-utility
And do a complete uninstall using the Avast Uninstall Utility Tool once everything is clean out from your HD, and to a clean installed of AIS and you shouldn’t have any further issue at all and it should run back to normal make sure you back your Avast setting first before you do a complete uninstall.