Hello,
based on the popups, it seems that you have sometimes in the history opened this page in your browser (or it has been opened within some other page?). The browser sometimes may try to open pages it has previously accessed, especially when you type into the address bar.
I recommend you to clear history of your browsing; this will prevent the browser from opening this page and thus prevents avast from detecting the page again and again. We are sorry but there is no way how we can do this for you automatically.
Kind regards,
Ondrej Kolacek