I have an endpoint which is running Windows 10 Home 32-bit. This user was experiencing an issue where almost none of their startup items were loading and they couldn't run any software once the computer booted.
I've uninstalled (using AvastClear) and reinstalled, but the problem still persisted. Disabling the behavior shield is what fixed this problem. I think that Avast's behavior shield is malfunctioning on 32-bit Windows 10.