Cheers mate, thanks for that. I don't know these things unless I ask. As you know, people will sell you anything (that's how I wound up with Mcafee). Thanks to your dedication to this site, I now know better.
I'll be running Avast free and Malwarebytes free ONLY as per your advice.
Avast is installing as I type. Once it is up and running, I'll be saying au revoir to Mcafee.
Regards,
Troy