Hi Tera, you have a pop-up's problem. You should disable pop-up's.
hers the link with instructions
https://support.avast.com/en-us/article/Antivirus-popup-notifications/
Alternatively in your browsers search on google for pop-up blockers and install. For example good one I use in chrome is
https://chrome.google.com/webstore/detail/pop-up-blocker-for-chrome/bkkbcggnhapdmkeljlodobbkopceiche?hl=en
Also add AdBlock to your browsers For example good one I use in chrome is
https://chrome.google.com/webstore/detail/adblock-%E2%80%94-best-ad-blocker/gighmmpiobklfepjocnamgkkbiglidom?hl=en-US
Avast together with Ad block and pop-up blocker work wanders against unwanted stuff for me as I find Avast's pop-up blocker to aggressive or I just didn't set it right.

Hope this helps.