I upgraded both PC and Notebook from windows 8 to windows 10 (64bits) and install Avast internet security as normal
When right click avast icon on notification bar then go to > Avast shields Control > Enable all shields (1 disabled)
It always showing (1 disabled) same on both PC and Notebook, I don’t know which shield is disabled, if all shields is already enabled it should not show like that.
http://i66.tinypic.com/2zp35o1.png
Look on Settings / Components look like all shield already running.