Just for the hell of it, I went to Programs and Features, went to "Change" Avast and hit "Modify" to see if by magic the old references to virtual or NG had returned. No.
So I did a Repair of Avast, went back to Programs and Features, and the Change options for Avast still do NOT show virtual anything or NG anything.
NG still does not work, in a really great, modern Dell desktop with tested hardware virtualization capacity.