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I had responded to an invitation to try Internet Security and then when it expired uninstalled it and reinstalled Avast Free, being careful at each point to re-boot.
Responding to your advice, I looked but couldn’t find the Avast uninstall utility on the download page and didn’t scroll down far enough to see it on the Support page. So uninstalled Avast Free, re-booted, installed a new Avast Free and re-booted. But the System > Components > Problem Devices still reported missing drivers for Avast Firewall–apparently from the Internet Security trial.
Went back and found the uninstall utility and applied it following the steps you listed and the System message about missing drivers disappeared. It was not necessary to boot into safe mode at any time. I’m sure you haven’t missed the idea that it would be better for sales of Internet Security if stuff were not left behind and much more easily fixed if the uninstall utility were included in the trial package or at least given a more prominent place on the main Download page.
Thank you for your help.