As the three license was offered at a price of around 20 euros (incl. Discount) on Amazon, I have struck again. Now I use NIS 2013, and am super happy: Resource usage is at all sites to be low, there have been no false positives and the Internet surfing is fun, because I perceive no speed brakes. The CPU usage share of NIS appears even in real time. The user interface I feel tidy pleasant.