A registry checker is another term for registry cleaner software.
How does a registry checker work?
The registry checker is scanning the thousands and thousands of entries in the windows registry and double checks and references it to existing files. It can find errors and fix them.
For example, the PC registry might contain an invalid entry pointing to system file on your computer. But an application was removed and uninstalled, but it left the entry in the registry, now pointing to a file which does not exist anymore.
The registry checker will detect this and give you the option to automatically or manually delete the orphaned entry.
There can be many thousands of such useless and orphaned entries, pointing to files which don't exist anymore, or deleted fonts and so on.
The worst case scenario is if an entry in the registry points to a file which is damaged, or a system file which might cause blues screens.
Registry cleaners and checkers can have a variety of scan levels, with some of the tools doing only a mild scan and barely really "repairing" anything in the registry. Other registry checkers can go much deeper and perform an in-depth scanning of operating system related registry entries and finding much more errors than other registry cleaners.
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