Have in previous years, always the Norton Internet Security software used on my computers. After this, however, not very well in the many test, I switched this year to Kaspersky. The good test results of the program are clearly justified. The software consumes very little system resources and always works silently in the background. I have not yet received any unnecessarily annoying warning messages like Norton. However, if a problem is detected you will be informed immediately and get a message on the management of Kaspersky.