Hi all, The Ccleaner Pro 5.64 update version crashed in the middle install, I had to go through the task manager to exit, (Windows 8.1Fr 64bits). When the computer reboot, many software are blocked, Thunderbird, Acrobat reader, and so on, or very slow like Firefox 73.0.1 “15 to 60 seconds for the Google home page”, the other six computers on the network without Ccleaner have a normal response time. The 5.63 Pro reinstall does not change the damage caused. Uninstalling Ccleaner Pro by the program manager no longer works. Regards.