Tuneup taking over browser with popups

Dave, Please provide AVG with a screenshot (https://support.avg.com/SupportArticleView?q=screenshot&urlname=How-to-create-a-screenshot) of the popup that you are seeing.
AVG Guru

I've been using Tuneup for years, but lately it keeps taking over my browser to open a new tab with some advert for Tuneup.  Taking over someone's computer in any way is completely unacceptable.  I'm getting tired of viewing something on the internet, just to have this page commonly pop up over it. 

How do I disable this malware-like behavior?  I'm an inch from uninstalling this thing.  Pretty sad, since I paid for it.

Dave, Please provide AVG with a screenshot (https://support.avg.com/SupportArticleView?q=screenshot&urlname=How-to-create-a-screenshot) of the popup that you are seeing.
AVG Guru