I don’t know if this helps, but here’s a thread you posted previously:
https://freerepublic.com/focus/f-chat/4266396/posts
So far, the advice has thoroughly confused me. Kaspersky was easy. The advice on Avast varied from it suddenly demanded payment to it to "it's wonderful". I have an Apple Mac, and don't see myself going to Linux. All the kind replies about Windows don't apply. So, is Avast a hidden minefield? Bitdefender? Something else?