Damages to registry caused by registry cleaner:

Registry Cleaners have their own disadvantages like poor distinction feature. However, some Cleaners easily make distinction about the severity of errors but they fail to rate errors and usually classify them critical without any reasonable ground for claim.

Discover the disadvantages using Registry Cleaners:

Critics often claim that there is no authentic way of knowing whether a third party application has an invalid key, redundant information or not.

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 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.

Capability of Recovery:

Registry Cleaner fails to repair those Registry hives that 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:

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.

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.

Virtualization of application:

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