This bug just does not want to go away. After a full scan, there is a notification in the system tray that it is complete. But when opening the notification in the GUI, it says it is 0%. After canceling, it stops, but when you back to check the notification, it still says 0% as if the scan is running again! So this bug has gotten worse! WILL THIS EVER GET FIXED??
Have you tried a repair? Control Panel>Programs and Features>double click “avast”> click “repair”>reboot.
If Repair doesn’t fix the problem, try the following:
Clean Install of Avast:
https://goo.gl/4Ptzkf
Looks like the Repair fixed it. I will report back with any further issues. Thanks.