Damages to MS registry caused by 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 disadvantages using Registry Cleaners:

Critics question the validity of Registry Cleaners on the ground that there is no reliable method of assessing whether the third party application contains redundant information, invalid key or not.

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 fails to repair those Registry hives that couldnt be mounted by the system.

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.

Cleaning 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 could not remove Registry entries associated with a rootkit because this rootkit hide the information from other processes.

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.