Quicktime 7.2 will not play Quicktime Movies

Ironic isn't it.
I recently purchased Sony's Movie Studio and it required a new(er) verson of Quicktime to import QT movies. So I download 7.2 ( i had 7.01, if I remember correctly) and installed it. I can now import QT into Vegas for editing. Fine. Great.
BUT, and here is the ironic part, Quicktime will no longer play Quicktime movies! Not .mov, .mp4, nothing. Zip. Zilch. But it will play some old avi files for some reason. All I get is the audio and flashing striped colors. Until 7.2 I could load any .mov, avi, mp4 file and edit them without a problem. (I forgot to mention, I had QT Pro) I was also using Any Video Converter to convert old home movies I'd burned to dvd to the mp4 format, and Quicktime worked flawlessly to open them too. Up until this "update" I've been very happy with the performance of Quicktime.
Now, nothing but frustation and the online Support hasn't pointed to a solution. And yes, I have updated my Dell PC running XP to all the latest service packs.
Any ideas? If I delete 7.2 I could probably re-install a version of 6 Pro that always worked, but then Vegas Movie Studio won't work. Kind of a Catch-22. Thank you for any help.

It has helped some who have had this problem. Try dragging the QuickTime webplugin folder to the desktop in case you need to put it back and see.

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Quicktime 7.2 will not play Quicktime Movies

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