I just got a new machine and thought to try the new avast.
What a disaster, loads of false positives and gliches everywhere. I persevered for a few days but it became such a pain.
I was really glad to uninstall it.
This was the second time I've tried avast and the second time I've dumped it.
I'm back on MSE which seems to be doing a decent job.
Small footprint, don't seem to slow the machine while booting or running and no nags to upgrade or adverts. That does it for me.