system
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If you haven’t already - you may try uninstalling completely, reboot, and then re-install. I had a similar issue on an Exchange server right after upgrading from 4.8. Uninstall/reboot/re-install resolved the issue and haven’t had any more issues with it.
Just for good measure you may want to use the avast cleaner utility after you uninstall just to make sure all remnants are gone.
jsbac