If your windows is configured correctly the system applies to create a restore point to each of the major changes that may occur (such as installing software or a component for Windows for example). Over time, these restore points sometimes accumulate unnecessarily space.
To tidy up, enjoy the dedicated function of CCleaner. Run the software and click on Tools in the left column and System Restore.
In the center of the window will be displayed all restore points identified, arranged chronologically (the reason for their creation is also mentioned). Simply select those you want to get rid of and click Delete. Enjoy some free space in you PC.