Quicktime not playing even with recent Codecs

Hi,
I apologize if this is not the correct forum, I wasn't too sure where to post.
I had a Promo video done for my business, it's in .mov format and played fine in Quicktime when I first received it.
Recently it stopped working, Quicktime opens to a black screen, my file name shows at the top and the Windows "loading" circle is spinning but nothing happens.
I have uninstalled/reinstalled Quicktime, installed all possible Codecs as listed in an Apple support page that I found (it had links to various Codecs required for Windows).
I have Windows 7 Home Premium 64-bit, service pack 1 and Quicktime 7.7.4
What kills me is that this file was working!!
Any help that I can get is really appreciated!

I also have a similar problem in Snow Leopard but it happens with Safari and all other browsers. Whenever I try to access embedded QT content I get the message "Required Plugin Misssing" and no QT plugin appears in the list for me.  When I attempt to install the plugin I get to an Apple page telling me that it is now built in to OS X. If I try to install an older version the OS will not allow it.  QT works fine outside of the browsers. From what I can tell this happened after a software update, my mac mini was hardly turned on for around 3 months and then came back into service.
I've poked around for about a month now and found that this is affecting quite a few mac users and has been for quite a while now.  No good solutions have come from the community so far, and from Apple, silence....
QT is their propriotary format and it is not working for many in their native browser, and from all appearances they seem to be ignoring the problem.  I think they need to hang up their iphones, turn down their ipods, and turn off their ipads and start paying a little attention to the technology their company was built on.

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