With regard to the protective effect, I rely on my good experience with G Data and test results in the trade press. (Including test winner at Stiftung Warentest). Virus problems I had not previously, but got information about suspicious, Total Protection repulsed attacks / events. Impairment of computer performance, I could not tell, though G Data takes a two viruses viewfinder used. Maybe my PC would go up and down even faster with a different product, but for the double security of two anti-virus engines I like to wait two or three seconds longer. Installation and Activation ran smoothly, although entering the license data can be admittedly somewhat confusing. See the comment of "Asesino" for (1-star) review of "E. Stieros". Useful I find the functions to encrypt and secure deletion of data. I've been happy with third-party software in the past, and have tested the latest versions of Norton and Kaspersky. G Data moment for me is respect. Security, compatibility with other programs and usability the most convincing solution.
