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I use that one because it’s the last version that wasn’t changed to be compatible with Vista. They also added a bunch of different features to it in v8 to make it more like CCleaner I guess and they made the registry cleaner a lot more aggressive. I really only use it occasionally because of it’s registry compaction feature. Now that I’ve switched from Auslogics defrag to the free version of Puran , which defragments the registry and even the MFT and pagefile when you do a boot defrag, I may not need Registry mechanic any more. I do use the registry cleaner in CCleaner on a regular basis after uninstalling anything or after removing Windows Update uninstallers after a period of time with no problems. I also periodically will run Auslogics registry Cleaner. I have never had a problem or had to use a backup from any of those programs. I actually have never even backed up a registry clean in CCleaner. That’s how much I trust it.