Originally Posted by
fink
It sounds like the junk problem is as much a user behavior issue as much as anything so it's hard to say how much adding Malwarebytes to the equation would help. It would help some certainly with warnings not to install problematic things as would the antivirus but really the owner of the computer would/should first need to learn safe computing habits.
Also worth noting is that installing Malwarebytes on Win 10 computers alongside an existing a/v program is now a bit more complicated because many a/v's will warn you not to do it even though the two programs almost always get along just fine.