Apr 18, 2018 ... WGA Notifications is part of the Windows Genuine Advantage program. For more
information about how to obtain the latest release of WGA Notifications, click the
following article number to view the article in the Microsoft ...
I've found the following solution. This popup was shown by Windows Scheduler
in a job named WGASetup. I just needed to get rid of it. It would be easy to delete
this job, but I think Windows Update, in its helpfulness would recreate it.