Quicktime screen is white, but audio plays

This is not a universal problem. All my videos that played before still play. I use QTPro v. 7.1.3 on both my G4 & my MacPro.
I was handed an audio for video clean-up project, but the QT videos provided will not play - the screen is white, the timeline indicator moves, and the audio plays as it should. Through browsing, I have gleaned that I am missing the proper codec. How do I know which one? The video guy who handed me the project says that the videos were rendered by Apple Intermediate Codec. All I can find are upgrades for this, not initial installs. Is this even, in fact, what I am missing?
Secondarily, once I figure out the codec mess, I will need to export a compressed version for import into ProTools. Any suggestions there?

I have tried opening in iMovie. Same thing there. The AI codec version that is showing up as the blank paper icon in System Drive>Library>QuickTime is v1.1. The only other video components that accompany that one in that location are the 3rd party FlipForMac WMV components I installed seperately quite a while ago. It looks like all other video components are located in the other folder...
...In the other folder, (System Drive>System>Library>QuickTime), it seems that all kinds of video components are there, and their icons look like little grayish-black video screens. No AIC exists there though.
I sure appreciate your help

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