I'm wondering if Howard678 means that the restore points were deleted manually. If he then ran CCleaner Registry Cleaner it would show the associated registry entries as invalid, which might then have been removed using the reg cleaner.
If by some chance I am right, then it would be no easy task to sort out. The registry entries could be restored by CCleaner but only if they were saved. Recuva could possibly restore the system files but I'm far from confident in any such process resulting in reliable restore points.
The Cleaning part of CCleaner is unlikely to have caused any issue. If you used the registry cleaner then there is always some risk, although the one in CCleaner has quite a good record.
We need to know exactly what you did, step by step to lose these restore points (and why). It might not be possible to get them back but with the full information there is some vague chance we could think of something.
Always pop back and let us know the outcome - thanks