I relative of mine recently was infected with TROVI malware. He runs the Norton Anti-Virus that comes free with a subscription to COMCAST.
Why doesn't Norton Anti-Virus block all the things that Malwarebytes Anti-Malware remover supposedly find and remove? Note that for TROVI, Malwarebytes couldn't get rid of it either ... I had to rebuild the system from scratch to fully remove it.
Seems like there are a lot of things out there that I would call viruses (you might call them Malware) that Norton should be blocking.