I am on premier account and I still get many unwanted ads and pop-ups which are really irritating. How can I find them and stop appearing?
You can turn it off in the latest version.
→ https://forum.avast.com/index.php?topic=151290.0
If they are not avast related ads…
Run a scan with Malwarebytes according to instructions here and remove what it find. https://forum.avast.com/index.php?topic=53253.0
Then clear your browsers with AdwCleaner. http://www.bleepingcomputer.com/download/adwcleaner/