Registry database mutilation 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.

Discover the disadvantages 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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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 fail to redeem scenarios like undeletable registry keys that occurred due to insertion of null characters in their names. However, there are few specialized tools available in the market, like RegDelNull utility and Sysinternals (now Microsoft), which could redeem such kinds of scenarios.

Recovery Power:

Registry Cleaner could not repair those Registry hives which couldnt be mounted by the system.

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.

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.

It is a must for a specialized tool to compare results from raw core registry storage with that given by Registry API.

Functioning of Registry Cleaners in case of application virtualization:

Registry Cleaners could not remove those Registry entries which are written for a virtualized application.