Eddy
7
It is not just the combination of Windows 8(.1) and avast that has problems.
Many people have all kinds of problems with the 8.1 update, avast users as well as people who are using another av.
I run a small “computer service shop” and as of this morning (when the 8.1 update was released for my country), the phone hasn’t been quiet.
It looks like the update is introducing more bugs than fixes.
I know for sure the people from avast (and other vendors) are already looking into it.
So let us have patience and wait to see what they come up with.