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CCleaner (/ ˈ s iː ˌ k l iː n ər /; originally meaning "Crap Cleaner"), [6] developed by Piriform Software, is a utility used to clean potentially unwanted files and invalid Windows Registry entries from a computer. It is one of the longest-established system cleaners, first launched in 2004. [7]
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. This may lead to loss of functionality and/or system instability, [3] [4] [5] As well as application compatibility updates from Microsoft to block problematic Registry cleaners. [6]
The hierarchy of registry keys can only be accessed from a known root key handle (which is anonymous but whose effective value is a constant numeric handle) that is mapped to the content of a registry key preloaded by the kernel from a stored "hive", or to the content of a subkey within another root key, or mapped to a registered service or DLL ...
In Windows 7 and later, significant hardware changes (e.g. motherboard) may require a re-activation. In Windows 10 and 11, a user can run the Activation Troubleshooter if the user has changed hardware on their device recently. If the hardware has changed again after activation, they must wait 30 days before running the troubleshooter again.
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He said TuneUp Utilities was a powerful and easy-to-use set of tools, with its disk cleanup and registry cleaner being the "bread-and-butter" of the suite. [ 33 ] PC World 's Preston Gralla reviewed the 2010 version and commented that TuneUp Utilities is a comprehensive suite that "includes everything from a startup optimizer to a defragmenter ...
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