No, it's Avast!

Thank you for your replies. Meanwhile, I have discovered many, many other quite unnerving malfunctions.

It becomes increasingly clear I have to resort to a professional to clean up this mess. An...

Alas, no.

Thank you. I just tried to do so. The problem seems not to reside in the browser, for with Internet Explorer exactly the same happens.

Hello,
Since I upgraded from Windows 7 to 10, Internet Explorer has apparently been replaced by Microsoft Edge. I experience difficulty with this new browser, in that it signals security problems...