Windows registry mutilation 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.

What are the disadvantages of Installing 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.

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:

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

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 fail to detect or delete Registry entries linked with a rootkit that can conceal this information from other processes.

To draw a comparison between the results of Registry API and raw underlying Registry storage, a specialized tool is required.

Do Registry Cleaners work in application virtualization scenario?

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.

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