N360.exe is causing high disk usage on my Windows7 PC

Norton 360 appears to be doing more than 5 million writes per second on my Windows7 PC. A lot of the write activity is directed toward C:\ProgramData\Norton......(various characters follow). I have Task Schedule set to manual update. This high level of write activity is freezing my computer. Does anyone have an idea as to what is happening and how to fix it?