I had problems to apply win10 v1607 update, and I tried to install it from ISO image.
The first try failed.
I uninstalled Avast Pro, and I tried again.
The update went fine.
The I decided to reinistall avast and... the os went in bluescreen at every restart.
After 20 minutes, I succeeded to start it in safe mode, and start avastclean.
From that point, Win10 was back to life.
I suppose that this last Avast version needs some more work....