I'm personally comfortable using stuff like NoScript where you actively need to work with it as you go about. My father, on the other hand, will either ignore or close any prompts that come up. For instance, I've already put Firefox and Chrome on his computer with AdblockPlus and Ghostery, because those are handsoff extensions. Other than that he's only got Windows defender right now. What additional antivirus, antiPUP, etc. things should I consider for him that would require no user input? Paid options are fine.