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Quicktime video (.mov file) will not load and play in Firefox 3.6.16

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I have a computer with Firefox 3.6.16 installed that will not play Quicktime videos (.mov files) in the browser. This is a desktop computer. Another computer (laptop) with exactly the same version of Firefox installed will load and play them perfectly in the Quicktime player. Both computers have Quicktime addin installed and designated as the default application for Quicktime movies. Both computers play the videos correctly in IE 8. When attempting to play the video in Firefox, the player window opens and attempts to load the video, but soon seems to freeze leaving a black window open where the player should be. From what I have observed, this seems to be a problem related specifically to this computer, and since the video plays in IE I have ruled out the firewall blocking loading from the site.