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•  Introducing CCleaner
•  Using CCleaner
•  CCleaner Rules
  •  About CCleaners rules
  •  Windows Tab
  •  Applications tab
  •  Registry Rules
•  CCleaner Settings
•  CCleaner How Tos
•  Troubleshooting
•  Advanced Usage

Registry Rules

When you click the Registry icon you will see all the available Registry rules that CCleaner can clean.

Missing Shared DLLs - Removes entries for libraries which are shared by multiple programs but no longer exist.

Unused File Extensions - Removes entries for file extensions that are no longer associated with applications.

ActiveX and Class Issues - Removes invalid entries for COM/ActiveX object that refer to a non-existing files.

Type Libraries - Removes invalid entries for type libraries that refer to non-existing files.

Applications - Removes invalid entries for non-existent programs.

Fonts - Removes invalid entries for fonts that no longer exist in the Windows Fonts folder.

Application Paths - Removes entries for registered application paths that no longer exist.

Help Files - Removes entries referring to help files that no longer exist.

Installer - Removes unnecessary uninstallers or the remnants of left over uninstallations.

Obsolete Software - Removes entries for applications that are no longer installed.

Run At Startup - Removes entries for Startup applications that no longer exist.

Start Menu Ordering - Removes entries for Start menu application that no longer exist.

MUI Cache - Removes invalid entries from a cache of recently run programs.

Sound Events - Removes references to sound files that do not exist.

Windows Services - Removes Windows Services, for which the executables are no longer present.