Norton blitz marketing...try mouse hover over pop-up X
if you see "Don't show again"....click "Don't show again" -- not the X
Did you try Auto Smart Scan Off or Edit schedule to your preference
Schedule Norton scans
Your Norton product detects when you are away from your computer and automatically runs scans to assure that your system is regularly monitored for threats. You can also schedule Smart Scan, Quick Scan, Full Scan, or your own Custom Scan to run on times of your choosing.