Video files won't open on iPhotos after library upgrade

I tried accessing my iPhoto library today on my iMac, and received this message "The photo library needs to be upgraded to work with this version of iPhoto".  I selected the "Upgrade" version accordingly.  At the same time, I also did an update on iphoto to version 9.5.1. 
After these upgrades were completed, I attempted to access my albums in iphoto.  Everything looked fine, except that I can no longer view any videos!  When I try to view a video, this error message appears: "A necessary data reference could not be resolved" and the screen is just blank.  What do I do? This is really upsetting because I have videos of events and people important to me who have passed away 

Hi Terence, thank you for your response.  The problem is that when I go back to Time Machine, I am unable to even restore to an earlier version.
When I attempt to open my video files and receive the error message "A necessary data reference could not be resolved", I went to "File" - "Reveal in Finder" - "Original File", but then received the message "QuickTime Player can't open "IMG_1929.MOV". 
Is this a virus or bug that subsequent updates will fix, or are my videos lost forever?
Thank you.

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