What are the MS registry disadvantages using a registry cleaner?

The biggest disadvantage of Registry Cleaners is their weak distinction feature. Some Registry Cleaners fail to rate severity of errors and those succeeded erroneously categorized errors as critical without giving proper reason of categorization.

Discover the drawbacks using 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.

Inefficient and poorly crafted Registry Cleaners could not make distinction between used and unused key for Windows. It could not assess the detrimental effects of removing used key from computer.

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Because of this loophole in Registry Cleaners, they often led to the situation like loss of functionality, system inability and Microsofts application compatibility updates to block malicious Registry Cleaners.

Registry Cleaners have their own limitations for instance they cannot correct scenarios like undeletable registry keys owing to insertion of null characters in their names. Some specialized tools such as Sysinternals (now Microsoft) and RegDelNull utility can perform this task.

Potential to Recover:

A registry hive, which a system is unable to mount, cant be repaired by a registry cleaner.

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.

Removal of Malware:

Despite all these problems, a corrupt registry can be recovered in several ways supported by Microsoft. For instance Automated System Recovery by using System Restore or by running setup from the Last Known Good boot menu.

Registry cleaners are unable to sense or flush out registry entries related to a rootkit that tends to conceal this fact from other procedures.

A specialized tool is needed to compare the results of Registry APIs with the raw underlying Registry storage.

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.