Thanks for reply - already tried Repair and many other suggestions - Uninstall - Avastclear tool in Safe Mode - Reinstall - Offline Installer etc. etc. - all to no avail. Still no UI and now no right-click scan. Avast now seems to be a basic “bouncer” at the door of my system (“your system is secured”)- but I have little or no control over him! Oh for the ‘good old days’ of 2016 when Avast worked well.