In my copmuter, my Avast did this problem as soon as I installed it, after removed AVG, but this worsen after the update, like here in my father computer.
Update: It turned out, that in my computer, Avast service process, AvastSvc.exe, don't do this problems, but only in my father computer.
When I will have an access to my father computer, I will remove MSE and reinstall Avast, and check if this problem returns.