I know it is an old issue, but I never had to encounter it until now. I dual boot Win 7 and Win 10 TP. Win 7 is set as my default OS. Just now, I went to my Win 7 and check my restore points. The latest was Nov 14. That means I lost quite a few already. I went to my Win 10 and found out all restore points are gone except the one image backup was done, Nov. 15. I need someone to show me how to fix this. I understand one can fix it by either employing Bitlocker or by registry hack. But I am not sure how to proceed with either one of the 2. I don't mind using registry to fix this if I get the procedures to do so. P.S. Yes, I have checked the box " Show more restore points ". In fact, Win 10 does not even have that box. Just one restore point shown.