CCleaner also lets you clean the Windows Registry, a database which stores configuration information, hardware and software settings on your system. Every time you alter system configuration information, install software or perform other routine tasks, these changes are reflected and stored in the Windows Registry.

Over time, however, the Windows Registry accumulates outdated configuration information and settings, including traces of obsolete programs. The CCleaner Registry option lets you scan and remove such information, improving the overall function and speed of your system, as well as protecting your digital privacy and security.

Tip: A scan of the Windows Registry should be performed on a weekly or monthly basis.

Step 1. Open ccleaner with your desktop icon 

Step 2.  Click on the Registry tab which is the second icon down on the left menu

The CCleaner Registry window is divided into a Registry Cleaner list, and a pane used to display information about any problems identified.

Step 3.  Click  to begin scanning for registry-related problems to be fixed

You should then see a list which resembles something like this:

Step 4.  Click  to fix all the problems found in the registry

As a precautionary measure before you begin fixing the Windows Registry, you will be prompted to save a backup file of your registry. I highly recommend that you let CCleaner do a backup.  Then if a problem occurs after the Windows Registry has been cleaned, you can restore the Windows Registry to its original state using this backup file.

Step 5.  Click Yes on the ‘Do you want to backup changes to the registry?‘ question

Step 6.  I would advise to leave the default save location for the backup file in your documents and then click Save

Step 7.  Next ccleaner will go through all the issues found in the registry

Note: Advanced or expert level users will appreciate the ability to fix some problems and ignore others, depending on their requirements. Average users and beginners are recommended to simply fix all the selected issues.

Step 8.  Click on  to fix all the selected issues

Step 9.  Click  to complete the cleaning process

The Windows Registry has now been successfully cleaned

Note: If you have any issues after cleaning your registry with any software, then I would recommend you recover your registry backup file