The Registry Cleaner has a Restore function which creates a back-up of the Windows Registry before every on-demand and scheduled scan and clean.
The backups are stored in date and time stamped folders in the location of your choice. You can store the backup files in your computer locally, on a computer in your network or even in an FTP server. This back-up function enables you to restore the registry to a previous state in case you encounter some system failure or if you want to undo any changes To understand and manage your Comodo System-Cleaner backup please visit Settings > Backup Settings section.
You can disable this option in Settings of the Registry Cleaner.
Note: Comodo strongly recommends not to disable back-up option.
Restoring Windows Registry from backup
Click Registry Cleaner > Restore.
Select the backup file that you need to return to...
... and click the 'Restore' button
Confirm your choice in the confirmation dialog.