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.
What are the limitations of 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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The abovementioned flaw in Registry Cleaners create some worrisome situation such as malfunctioning of system, loss of functionality and accessing Microsofts application compatibility updates to prevent harmful 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 fails to repair those Registry hives that 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.
Removal 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 fail to detect or delete Registry entries linked with a rootkit that can conceal this 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.
Functioning of Registry Cleaners in case of application virtualization:
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.