Quicktime Audio plays - no video

Have a site (www.myefa.org) that is used by MANY worldwide to learn English. The site has been active for quite a few years and has streaming video. We use Quicktime exclusively and are rethinking that decision.
After the 7.1 and higher upgrades the site's video no longer works. We have CDs to use with the site (also containing video) that do not work anymore either. The audio plays the video does not.
We have our users "downgrading" to 6.5.2 and explain that iTunes won't work. They must choose and aren't too happy about it.
The site listed above is used in school lab settings and by individuals. Many support persons (including moi) have attempted "fixing" the problem to no avail. We have performed all Troubleshooting tips given on Apple's site along with tips given in this forum...nothing seems to work, including installing 3rd party codecs.
ANY help would be greatly appreciated. If you go to the site www.myefa.org, click on Visitor, then an episode. Choose any camera icon to see video...chances are pretty good you'll hear audio but see white video.
If you do get audio and video please forward your settings to [email protected]
Thanks in advance for any assist.
Gateway Windows XP Pro

Well, you've given us something to ponder. Thanks for that.
I also retried the CD's we have for the site (same video taken from the CD instead of streaming after clicking on the link) and get the following:
- the plugin was found, but an error in the plugin occurred.
- The plugin did not initialize properly.
From the Apple/Quicktime site the message is a wee bit different:
- An error occurred inside the plug-in on this page. (interesting that plugin is hyphenated here).
Again, all help is welcome and I appreciate your response.

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