Damages to Registry Caused by Registry Cleaner
Windows registry mutilation 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 limitations 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.
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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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 have their own limitations for instance they cannot correct scenarios like undeletable registry keys owing to insertion of null characters in their names. Some specialized tools such as Sysinternals (now Microsoft) and RegDelNull utility can perform this task.
Potential to Recover:
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.
Malware elimination:
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 are unable to sense or flush out registry entries related to a rootkit that tends to conceal this fact from other procedures.
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 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.

