Norton 12 Not recognizing prior backups

I backup my restore point approximately once a month on my laptop.  When I try an incemental restore it shows that i have no restore points and asks to create a new restore point.  If I go to "Manage Restore Points"  the restore point is clearly recognized to recover from.  I have reinstalled Norton Ghost and that doesn't seem to fix the problem of always deleting and re-creating a new restore point. 

 

Thank you in advance for your assistance.