What is my Norton doing?

My task manager currently shows Norton 360  using almost 30% of my CPU while I am doing things on the computer. I opened up Norton 360, selected "Performance" and then clicked on "Norton Tasks" link on the left side. It doesn't give me any indication that some task is currently running, but every few minutes the "Pulse Update" ran for 2 seconds and was completed and that it was not run while it was idle. Is that what it is doing without any indication that it's running and not giving me the option to stop it?? It's driving me nuts to listen my computer fan's whirling noise because of this unscheduled task. Any way to stop it? Thanks..