You got it easy. I still use Win 7 on an old PC at work (for odds and ends), and it used to load up upon startup too, but it always shows that it is turned off (unchecked) in the settings. My PC was so slow on most of my boot ups that I figured that it was the browser attempting to start up and all that goes on behind the scenes with it. I mean it took an hour to somewhat use it, and then it would simply lock up completely some times even then. Sure enough I uninstalled it and now it runs free and easy upon start up. Sure, shame on me for using Win 7, but Avast updates everything OK when there is an update (doesn't complain it finds Win 7), outside of them pushing the browser on me/us, it's been decent.
I am also considering making a change of the main AV next renewal date if they keep this up.