Hi I was having the same problem with my computer and read this screen earlier, I knew I couldn't follow all the info so I ran spybot
s&d advanced mode and its been over two hours and my norton screen has not come back on! Before it came on every 2 minutes, haven't tested it for a whole day yet but it seems to be working. P.S. I disabled my norton first before using spybot. Hope this helps everyone!