CCleaner is a tool for improving system efficiency by cleaning up files, fixing registry errors, and managing system startup. Removes unnecessary files like cache, temporary files, browser history, restore points, and duplicate files. Includes tools for cleaning the registry, uninstalling programs, and erasing free space on the drive. Ideal for users aiming to boost system performance by cleaning up unnecessary files and fixing issues. CCleaner had a past security incident but current versions are secure with regular updates.
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