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>>> Any suggestions for a good quality virus scanner in which I can have some confidence in regarding a reasonable choice in how it operates.

All antivirus operate like rootkits. It's basically a rootkit trying to block other rootkits to install.

Microsoft has the advantage to have access to all windows API and they put a ton of efforts in testing/compatibility. It is the least worst of all evil.

Everything on the market has had something like this bug. I'd stick with Defender simply because Microsoft will put the resources into dragging their coding practices out of the 90s and they're better about general QA testing.

I'd recommend Avira.