System Restore is a Windows feature to restore or get back your system file to an earlier point in time. You can use it in case any system file has been deleted accidentally.Sometimes people create new restore points without deleting the old restore points. You can delete old restore points to free up disk space. So follow the below steps to delete a restore point
• Go to Disk Cleanup or type CLEANMGR in the Run command and press enter. Select the C drive and click OK. Now disk cleanup box will appear, click Clean up system files.
Another drive selection box will popup, select the C drive. In the disk cleanup box click More Options on the top and click the second option, System Restore and Shadow Copies.
Now click Delete and you've done.
Also Read: Tips to Free up Disk Space