Photo Booth iSight "in use by another application" - possible fix!!!

Hi everyone.
I'm running Mac OSX 10.4.10 and a few days ago I developed the problem of the inbuilt iSight camera in my new 20" iMac failing to work with Photo Booth, iChat etc. I kept getting the dreaded message "in use by another application".
After trying various fixes and tips from elsewhere I finally came upon a website which had a hint saying you could disable the iSight camera by moving the "QuickTimeUSBVDCDIgitizer.component" file from the System/Library/Quicktime folder.
Even though this wasn't related to my problem I checked to see if I had the file and realised it wasn't there! So I downloaded it from another source, popped it in the folder mentioned above, and hey-presto! My iSight is now working again. I have no idea why the file was missing originally.
If anyone else has had this problem please check this out, it may just work for you too!

You can get it here. http://techslaves.org/index.php?page=17 It is in the first part of the page there are two links.

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    http://docs.info.apple.com/article.html?artnum=303446
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      http://support.apple.com/kb/HT2090
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