After studying various tests and reviews on Amazon, the choice fell on G Data. I noticed in the research is that there is really to complain about with every manufacturer anything.
So I decided the same for the current 2015 version. The download and installation have worked perfectly. In contrast to the pre-installed McAfee, I could not notice any slowdown. Whether you're turning on the Lenovo or program starts, everything works within 1-2 seconds.
The user interface is clearly arranged designed as the Norton 2014 even though I was quite happy with that.
The first impressions of the G Data Internet Security 2015 software are therefore absolutely positive.