I've tried various virus scanners, the "Test Winner" which mercilessly burn itself into the sytem and mess after a test phase with advertising and purchase coercion day, and Betriebssyytem. Although Norton is also very resident but I have now for over 8 years, products from Norton and was always very happy. The scope of operation is becoming more powerful is probably due to the time and the ever-increasing threats. I also have Norton 360, but realize this is the Internet Security perfectly adequate for me and easier to use. The circumference of 360 I do not need most of the features are always integrated in Beriebsystem.