Hi, today I was asked to update Parallels Desktop 12 which also required an update of Parallels Tools. I use several Windows 7 virtual machines. As far as I tried all show the same behavior: after startup and login Parallels Tools are installed and at about 40% the system crashes. I tried both ways that are described in two articles concerning that behaviour, none worked. Windows 7 can be run in save mode which shows that the recurring installation of the Parallels Tools is for sure the cause. I have tried that several times with always the same results. Can anybody advice what to do next???