I use Kaspersky Internet Security for many years. I usually buy a 5 Series license together with a colleague. Whether PC od. Laptop, any Windows PC is fed by me with Kaspersky. I had all those years never had problems with viruses, Trojan horses and other epidemics. The software itself is simple. All (most) runs in the background, nothing is complicated. Even you do not hand applying) This license 2er time went to my niece, who is a Win has bought 8 laptop. I have it their gift and also installed. It is very easy to install. What can one say? All colleagues have the four-protection systems, Kaspersky, and now my employer as well. None of which mucks so KIS is top!