Disk Cleanup can be used to remove all but the most recent Restore Point.
Go to Start - Run and type Cleanmgr then press enter
Select the drive where Windows is installed and press OK
Click on the More Options tab
Click on Cleanup under System Restore
If System Restore: Obsolete Data Stores entry is available remove them also. These are files that were created before Windows was reformatted or reinstalled. They are obsolete and you can delete them.