I'm not the original post, but am being really bugged by these warnings about Google search engine. It popped up again today.
In C:\ProgramData\AVAST Software\Avast\log,
I see four files. Here they are with last date modified:
Avast-Browser-Cleanup.log 8 April 2016
Avast-Browser-Cleanup-silent.log 27 November 2016 (today)
Avast-Browser-Cleanup-silent.old.log 19 November 2016
Avast-Browser-Cleanup-trace.log 8 April 2016
I can attach or send to you, if you are still listening, Moroni of the Avast Team.