Why did I upgrade QuickTime not knowing this?

This question has been asked before, but it has never been answered. I have an older version of iMovie (pre-iLife) and did not realize that if I upgraded to the latest QuickTime that I could not use iMovie.
I was working on a professional project, and now I can no longer do anything with it. iMovie keeps crashing, and I know of no other upgrade that will help fix this problem. It is really testing my patience with the software developers here, especially since as a start-up home business I cannot afford to purchase iLife.
Since my software update has not given me an upgrade for my version of iMovie, I don't know how to resolve this issue. Ironically, any movie I have made subsequent to the QuickTime upgrade work just fine. I don't have the time to start over again with the other project, though and I will lose my first client as a result of this problem.
Any technical help will be greatly appreciated, especially since this is a crucial problem.
Dual 533MHz PowerPC G4   Mac OS X (10.3.9)   All necessary software upgrades

Hi Poetwarrior:
I feel your pain...
Which version of QuickTime do you have now? I am assuming it is the latest.
If you have QuickTime 7-try this reinstall. With OS 10.3.9 and iMovie 4, you need to use QuickTime 6.5.2 for the best results IMPO.
About the QuickTime 6.5.2 Reinstaller for Mac
http://docs.info.apple.com/article.html?artnum=301505
Keep me posted, please.
Sue

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    #*Clean re-install: http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Clean_reinstall
    #*You may also need to reset your extension databases in your profile folder. Do the procedure after locating your profile folder (see "Back up your personal information" above) and closing Firefox. The files will be automatically re-built when you re-start Firefox: http://kb.mozillazine.org/Unable_to_install_themes_or_extensions_-_Firefox#Corrupt_extension_files

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