Users of Avast Antivirus who upgraded to the latest version 12.2.2276 are finding that their Avast Background service is not running as a result of which the antivirus does not work properly.

To fix this issue, you may run C:\Program Files\AVAST Software\Avast\AvastEmUpdate.exe and then reboot your computer.

If this does not work for you, download the latest installer from the Avast site - as they have now fixed the issue - and install it on your Windows PC.