We have already shown how to delete all but the most recent system restore point in Windows 7 so that you can easily free up disk space. What if you want to delete all system restore points at a time?
Although you can disable Windows System Restore feature to remove all restore points easily, disabling System Restore feature is not a good idea. So here is a simple way to remove all system restore points in Windows 7:
1. Type sysdm.cpl in Start menu search field and hit enter to launch System Properties.
2. Switch to System Protection tab.
3. Under Protection Settings, select the drive and then click Configure button.
4. In the resulting dialog-box, click Delete button to remove all restore points including system settings and previous versions of files.
5. When you see the System Protection confirmation box, click Continue button to start the process. Wait for a few seconds to see “The restore points were deleted successfully” message.
6. You can now manually create a fresh system restore point (if you like to do so) and close all boxes.