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CCleaner cleans out the Registry to help prevent errors from occurring, which can help it run faster. Over time, the Registry can become cluttered with missing or broken items when installing, upgrading, and uninstalling software or updates. Why CCleaner cleans the Windows Registry:

You can read more about the Windows Registry on Wikipedia. The Windows Registry is a set of files that contains settings for your Windows PC, such as what program to use to open HTML files, when your antivirus program should run, or what desktop background you use.

To skip to instructions for Registry > Registry Cleaner, go to Clean your Registry with CCleaner for Windows further down this page. This page explains what the Windows Registry is, why CCleaner cleans it, and how to clean it.