Computer Learning

[cintrix]

All three computers have auto update. All three computers have Avast. All three computers use the same router. Those are the common denominators that I can think of. Should I try to completely delete Avast and use Defender instead on one of them? If so, how do I get Defender to work? I think Eli mentioned it is on the computer. How do I get it back because I don't see it on here.