No CCleaner did not touch it. Nor did Revo Uninstaller, nor did stopping all notifications in Edge and Chrome. I called Dell and after 3 technicians got on my computer remotely, we finally found that it was something installed by Fast Company (checked Task Manager when the popup was running), executable was named nwjs.exe. It appeared to be installed the day I removed McAfee from my new computer - first day I had it. It was called PC App Store. We uninstalled it and finally the pop-ups stopped. Further research McAfee claims it is not their software doing this. But then when I had not installed anything else on my computer on the first day, why did it get installed? 
I did not want McAfee and did not renew it. I am now repeatedly tormented by pop-up ads pushing me to buy McAfee.  I did not spend so much money on a new Dell to be interrupted and distracted by advertising while I am trying to work. This is making me so angry that I wish I could return the computer.  How do I make the ads stop?  The directions that I have don't work as when I go to uninstall the app I can't as I don't technically have McAfee.  This is a great way to alienate customers.
McAffee Pre-installed Software