1. It’s gotta be somewhat about the interface because A LOT of people on here have complained… so it isn’t irrelevant.
  2. I had zero problems when I switched from 7 to 8… zero. I have found more bugs on 9 then I care to admit.
  3. I haven’t had any experience with the 179, only what I’ve read on here, however if you call avast and look for tech support, avast cannot completely absolve any/all responsibility when they are putting their name on the product/service/forum/guy in china answering the phone.