Quicktime files suddenly won't open

Hi, I'm running OS 10.8.5.  Recently updated some codecs and various other updates for my OS--the most recent updates.  Now my videos will not open, nor will jpg's open in Preview! (?)  No error messages, just won't open.  I am a video artist, and have various file types--it won't open any .mov, .mp4, or any others.  All do open in VLC, so it's not the vids.  I've been running QT 10.2 with no problem till now.  Some weirdness: I noticed that when I updated iTunes (which may have nothing to do w/ this), it updated to the Yosemite version (12.0.1.26), though my OS is Mountain Lion.  Help?

Unfortunately, the latest version of QuickTime does not have the ability to export using third-party plug-ins, however Apple has made QuickTime 7 available to install alongside QuickTime X. You can install it from the Snow Leopard install disk or by running a Quartz (*.qtz) file.
QuickTime 7 will install to your Applications/Utilities folder.

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