Well, as usual I have learned something from reading the board. I didn't know about Malwarebytes, but decided I should add it. While out shopping today, I discovered that Sam's club is selling a retail box, Pro version, 3 one year licenses for $24.98. (The online price is $24.95 for 1 license.) Needless to say, I bought it, and am installing it now.
Thanks to all who contributed to this thread.
