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It can save from a complete reinstall sometimes. It's nice to have in your arsenal for actual problems as it can revert many of your registry settings to default, fix file permissions, firewall issues.etc. There is another freeware app I like that can fix many common PC problems, windows repair.
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Also has a defragmenter, but there is no reg cleaner attached to it, it's seperate for a reason and reg cleaners should only be used as a last resort.
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The disk cleaner from Wise works very thorough at removing junk and can remove the windows update patch files that are no longer needed after a successful patch. Crowd-sourced and cloud-based, SlimCleaner combines a powerful PC cleaning engine with a community of tech-expert users who provide real-time feedback about the apps and items on a PC, to help others improve their own computer. However I was recommending the disk cleaner, not the reg cleaner. SlimCleaner lets you clean as well as optimize your Windows system using a crowd-sourced approach. A developer or group or company can only look at so much software on so many systems, whereas with a crowd the amount of data expands. Most enthusiasts who are smart would never recommend using registry cleaners and often they are not needed. A different approach to cleaning &/or optimization relying on the communitys experiences & results, rather than the developers choice of rules hard-coded into whatever app. In fact HP had a line of PC's years ago that when 1 key was removed, you could not boot and that key was apparently deemed safe for removal by Crap Cleaner.back when CCleaner was called that. Did you select all unsafe entries too? Actually any registry cleaner could cause any PC trouble.