Several times of day, sometimes lasting for hours, and sometimes ephemerally, N360.exe uses 50%-60% of CPU. I'll try to open a program, find my computer (Vista Home Office Premium; Dell Inspiron 530; Norton 360 21.5.0.19) extremely slow; the Task Manager will show that the n360.exe process is consuming 50-60% of CPU. I've used 360 since it was offered; I update automatically; everything else works fine; this is a wholly new problem. Does anyone know a solution? Thank you.