This happening too frequently now.
Almost (not always) after upgrading to Avast Internet Security 2014, AVAST 2014 R3 SP1 (9.0.2018) i have this warning:
i can reactivate it but after rebooting the same thing again and again and again and again........
Of course before installing this new version i uninstalled the other using the avast uninstaller, so this was a brand new clean install with that bug included.
I'm using Windows 7 64 bits.
BTW version 2016 worked flawlessly for me.