I use Avira now for several years and have decided about 2 years ago for the paid version and my decision so far no regrets. The 2013 version is again top. Use mainly the backup function and am always amazed at how Avira manages that you hardly will notice the program in the background. This was at Norton, GDATA and Co with me currently not the case - anywhere these applications make it noticeable in the resource management. Toll is also the additional tool to clean your computer of unnecessary components and services, which only delay the startup.