Help! my itunes won't open!

I tried to upgrade my itunes to the new itunes 8 but there wasn't enough room so I canceled it halfway. Now whenever I click on itunes to open it it doesn't open. Instead a message pops up and it says "The itunes application could not be opened. A required itunes component is not installed. Please repair or reinstall Quick Time. (-42404)" But I have reinstalled and repaired Quick Time and the message still pops up. Does anyone know what to do?

Try deleting your iTunes preference files (com.apple.itunesxxx.plist, in your user's Library -> Preference folder) and see if that cures the problem.
Hope this helps.

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    replying to DanteSpyke
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