OK, I think I followed all the steps suggested, except perhaps for the timing of uninstalling Avast -- I didn't do that until all the other steps were completed because I could not find a method to do so. Finally after a google search, I found the link to the Avast Uninstall Tool, which I had to run in Safe Mode.
I really appreciate all your help on this forum, unfortunately, ScorpionSaver is still showing in my Programs and Features (although SS Services is gone now). And I'm still getting notice from Symantec that it is finding and quarantining files.
Suggestions?