Thanks DavidR, I was hoping to avoid reference to the paid version, as this is not a factor for me. When I asked about the difference it is maybe a much simpler question: what each does (the same thing or different things, or one is more thorough, etc). When I do a smart scan it is finding any problems, even in the advanced section (which Bob explained specifically pertains to paid components).
Is there another kind of scan that is not a scheduled/manual scan? Or is your point that the automated background activity, even on the free version, catches all that a manual scan would already?
Thank you Bob for the video, it is very clear. Maybe the next time I worry about a possible infection I'll go back to Full Scan and assume, if it takes longer, it is more thorough. (?) I do have an odd thing happening for which, between Avast and Malwarebytes I had hoped to catch. No luck...a bit worried. And thanks rocksteady, between the three of you I think I'm good to go.
By the way, I was not notified of these replies, and even after opening up the forum (logged in) I still found no evidence. Should I have received an email or a notification on my profile here? Even looking at the feed for this topic I couldn't find my question, had to use search to find it. ??