I got myself the system for my PC and Win 8.1 em Win7 laptop my wife. It lies easily installed under Windows 8.1 with me and works perfectly. However, there lies not install under Windows 7 on the laptop my wife. Despite many attempts and adjustments as old virus scanner to delete, run Trojans and other search and Entfernprogramme like Kaspersky itself to examine the system and to clean, it can not install the. For the second system so nothing paid. But it does not utner Win 7 can be installed and Kaspersky with its testing systems fails hinzubekommen that, there are the two star deduction.