Usually you have to delete all Restore points since they are corrupt, reboot and setup a single new Restore point. You lose all previous restore points that are no longer usable. Win 10 has new Recovery methods you should investigate in Settings, Update and Security.
You should find out why you are using System Restore so frequently. Go to Drivers download site and let the scanner check if all your drivers are up to date for Windows 10. www.dell.com/.../advanced