Registry Database Mutilation Using a Registry Cleaner
What are the registry disadvantages using a registry cleaner?
A problem associated with registry cleaners is that some of them do not rate the severity of errors, and most that are able to do this incorrectly classify errors as critical, with diminutive reasons in support - a contemporary form of snake oil.
What are the disadvantages 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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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.
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:
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 could not remove Registry entries associated with a rootkit because this rootkit hide the information from other processes.
A specialized tool is needed to compare the results of Registry APIs with the raw underlying Registry storage.
Do Registry Cleaners work in application virtualization scenario?
Registry Cleaners could not remove those Registry entries which are written for a virtualized application.
