MS registry mutilation using a 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 limitations 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.

Weakly developed registry cleaners may certainly not identify whether a particular key is still in use by Windows or what dire consequences it may have on being removed.

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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 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.

Potential to Recover:

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

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.

Cleaning of Malware:

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.

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

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

Virtualization of application:

Registry Cleaners prove inefficient in case of virtualized application because all the Registry entries are written for virtual Registry. This virtual Registry is specifically designed for a virtual application instead of real one.