I upgraded to QT 7.5.5 and now I can't play file

Hey QuickTime Golden Gods, I was wondering if you can help me with this: yesterday I downloaded and installed the newest QT (7.5.5, free version) and now I cannot play a .mov file with which I had no problems at all before. When I try to open it, all I get is a pitch-black screen. This also happens when I try to open it with Internet Explorer and Mozilla Firefox. I tried it in a different computer (same OS) which has an older version of QT (same versions of IE and Firefox) and it works beautifully, so the problem has to have something to do with the new QT.
I uploaded the .mov file to SendSpace - I'm not sure if this is the right etiquette, but I thought you might want to check the file for yourselves; it's the "interactive booklet" for The Hold Steady's 'Boys and Girls in America' album:
http://www.sendspace.com/file/dmjxv8
A million thanks in advance for any help you can throw my way.
-The Soup Nazi

I have same problem but how do i uninstall 7.5.5 w/o whole system reinstall?
I downloaded older quicktime, deleted current quicktime, but upon installing it says can't install cuz newer version is running.
Help.

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I upgraded to QT 7.5.5 and now I can't play file

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