What are the MS registry disadvantages 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 limitations of Installing Registry Cleaners:

Critics often claim that there is no authentic way of knowing whether a third party application has an invalid key, redundant information 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.

Make sure you have an effetive and proven Registry Cleaner to make sure you get a fast XP

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 fails to repair those Registry hives that couldnt be mounted by the system.

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.

Removal 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 could not remove Registry entries associated with a rootkit because this rootkit hide the 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.

Do Registry Cleaners work in application virtualization scenario?

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.

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