Microsoft dropped the automatic registry backup procedure to shrink Windows 10 size.
For such a registry backup to work in Windows 10 1803,1809,1903,1909,2004 and newer Windows 10 builds, you need to manually turn on automatic registry backup through the special reg parameter (this must be done beforehand before problems with the registry appear). On Windows 10, the registry files are automatically backed up to the C:\Windows\System32\config\RegBack folder. If these commands did not fix your problem, you need to restore the registry from the last restore point or registry files backup. If the SFC utility found errors and couldn’t perform a repair ( Windows Resource Protection found corrupt files but was unable to fix some of them), you need to check and repair the component store using the DISM command: DISM /Online /Cleanup-Image /RestoreHealth We’ll get to the easier tools a bit later, but we think it helps when using those tools to understand how this stuff is handled in the Registry. If you want to clean things up the truly geeky way, you can do from Registry Editor without the need for third-party software. If the utility finds a damaged system file, it will try to repair it. The Hard Way: Remove Items from the Context Menu by Editing the Registry. Open a command prompt as an administrator and run the command: sfc /scannow It is recommended to use the Dism.exe and Sfc.exe command-line tools to check the integrity of system files (including registry files), and fix the errors. However, starting with Windows 7, Microsoft stopped supporting the Scanreg.exe tool. In earlier versions of Windows, the Windows Registry Checker tool (Scanreg.exe) was available to automatically back up the registry, and check the registry for invalid entries, empty data blocks, and other errors. On Windows 10, the registry files are automatically backed up to the C:WindowsSystem32configRegBack folder. If your Windows does not boot correctly due to the damaged registry, you need to check the integrity of the registry files.
This one is really powerful, cause it doesnt clean registry automatically (like I imagine most of registry cleaners do), but it offers users to browse invalid entries it finds, and then choose which one to fix, and how to fix them, like defferent options for paths for example, that app finds during HD scan for those string-values. Under certain circumstances, uninstalling older versions of Receiver for Windows may leave some files behind on the computer and in the registry. It is called Registry First Aid (shortly Reg 1 Aid), from KsL Software, published by RoseCitySoftware: P.S., However, there is one program that I would recommend. Secondly, I also found the the following testimonial for "Registry First Aid" from someone who was nixing registry cleaning: I followed the link in the previous post and found a program that you may want to investigate: