N360.exe runs frequently carrying out various tasks under Settings - it doesn't say what it is doing but scans are only occasional. These runs take several minutes, during which I can't start programs and others get suspended until the activity stops. N360 CPU Usage is often at 99% as reported by Windows Task Manager. There are always two versions of N360.exe, one running under SYSTEM and the other under my user name. The one under SYSTEM is the one with the problem. My system is running under Windows XP with SP3.