What are the registry disadvantages using a registry cleaner?
A problem associated with registry cleaners is that some of them do not rate the severity of errors, and most that are able to do this incorrectly classify errors as critical, with diminutive reasons in support - a contemporary form of snake oil.
What are the disadvantages of Installing Registry Cleaners:
Most importantly, security critics claim that there is no authentic method to determine if third party software contains a valid key or contains useless information.
Some Registry keys fail to identify used and unused key for Windows and could not determine the effects of deleting used key from computer.
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This has given rise to instances like system instability and/or loss of functionality, and subsequently, the release of application compatibility updates by Microsoft for blocking the registry cleaners causing problems.
Registry cleaners are unable to repair undeletable registry keys created by null characters embedded in their names. This can only be done by dedicated tools like Sysinternals RegDelNull, which is now owned by Microsoft.
Potential to Recover:
Registry Cleaner could not repair those Registry hives which couldnt be mounted by the system.
Nevertheless, it can recover a corrupt registry in numerous ways backed by Microsoft; for example, Automated System Recovery, from a Last Known Good configuration, by enabling the setup to re-run or by deploying System Restore.
Cleaning of Malware:
However, there are several ways supported by Microsoft to repair a corrupt Registry. For example Automated System Recovery feature of Windows XP wherein last Known Good boot menu is achieved by using System Restore or by running setup.
Registry cleaners are unable to sense or flush out registry entries related to a rootkit that tends to conceal this fact from other procedures.
To draw a comparison between the results of Registry API and raw underlying Registry storage, a specialized tool is required.
Functioning of Registry Cleaners in case of application virtualization:
Registry cleaners fail to prove worthy in sanitizing registry entries related to virtualized applications as registry values in this case are written on a virtual registry that is application-specific in place of a real one.
