Serious Issue: Latest CCleaner Can Brick Windows 10 in CCleaner Bug Reporting Posted 16 minutes ago Registry cleaners always run the risk of breaking the operating system, always have and always will. Then there's also the issue with other things being updated so much that can break the operating system as well and it's not just limited to updates from Microsoft, other software makers can release buggy software or drivers that will wreck the operating system - been there and done that especially with Win98 and WinXP, but the issues still exists with Win10. One thing for certain make regular disk image backups of the drives necessary for Windows to an external/portable disk drive that you unplug after making the backup. Try to have at the absolute minimum three known good backups, it will eventually save you allot of grief at some point. There's many good freeware tools that can disk image your system and have it up and running in minutes (especially if on an SSD) should a restore be required, and it will be as if nothing changed on the system based on the disk image date/time. Of course don't forget to periodically backup internal secondary disks/partitions too.