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(A form of defragmentation capability has been built directly into Windows since Vista.

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using the free Microsoft-supported PageDefrag tool), rather than attempting to clean the Registry 's contents, has a measurable benefit and has therefore been recommended in the past by experts such as Mark Russinovich. Slowdown due to Registry bloat is thus far less of an issue in modern versions of Windows.Д¬onversely, defragmenting the underlying Registry files (e.g. Furthermore, versions of Windows prior to Server 2003 may fail to start up if the Registry and kernel files are unable to fit within the first 16В MB of memory. However this is less of an issue with NT-based operating systems (including Windows XP and Vista), due to a different on-disk structure of the Registry, improved memory management, and indexing. On Windows 9x computers, it was possible that a very large Registry could slow down the computer's start-up time.

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The lawsuit alleges that the company sent incessant pop-ups resembling system warnings to consumers' personal computers stating 'CRITICAL ERROR MESSAGE! - REGISTRY DAMAGED AND CORRUPTED', before instructing users to visit a web site to download Registry Cleaner XP at a cost of $39.95.

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In October 2008, Microsoft and the Washington attorney general filed a lawsuit against two Texas firms, Branch Software and Alpha Red, producers of the 'Registry Cleaner XP' scareware. Rogue Registry cleaners are often marketed with alarmist advertisements that falsely claim to have pre-analyzed your PC, displaying bogus warnings to take 'corrective' action hence the descriptive label ' scareware'. The rogue security software ' WinFixer' including Registry cleaners has been ranked as one of the most prevalent pieces of malware currently in circulation. The worst of the breed are products that advertise and encourage a 'free' Registry scan however, the user typically finds the product has to be purchased for a substantial sum, before it will effect any of the anticipated 'repairs'.

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Registry cleaners have been used as a vehicle by a number of trojan applications to install malware, typically through social engineering attacks that use website pop-up ads or free downloads that falsely report problems that can be 'rectified' by purchasing or downloading a Registry cleaner. The Windows Installer CleanUp Utility was a Microsoft-supported utility for addressing Windows Installer related issues. This may lead to loss of functionality and/or system instability, as well as application compatibility updates from Microsoft to block problematic Registry cleaners. A poorly designed Registry cleaner may not be equipped to know for sure whether a key is still being used by Windows or what detrimental effects removing it may have. It is not always possible for a third-party program to know whether any particular key is invalid or redundant. Removing or changing certain Registry data can prevent the system from starting, or cause application errors and crashes. Some Registry cleaners make no distinction as to the severity of the errors, and many that do may erroneously categorize errors as 'critical' with little basis to support it. The correction of an invalid Registry key can provide some benefits but the most voluminous will usually be quite harmless, obsolete records linked with COM-based applications whose associated files are no longer present. ( December 2014) ( Learn how and when to remove this template message)Дue to the sheer size and complexity of the Registry database, manually cleaning up redundant and invalid entries may be impractical, so Registry cleaners try to automate the process of looking for invalid entries, missing file references or broken links within the Registry and resolving or removing them. Unsourced material may be challenged and removed.

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