I've never had any problems with iTunes,

I've never had any problems with iTunes, and one day, without doing anything to it, I tried to open it and it said "iTunes cannot run because some of its required files are missing. Please reinstall iTunes." I've reinstalled it countless times and it still keeps giving me that message. I don't know what to do.

Hey grossa2,
First, here is a way to report an issue with your purchase:
How to report an issue with your iTunes Store, App Store, Mac App Store, or iBooks Store purchase
http://support.apple.com/kb/HT1933
Then, I'd go through this article, which helps troubleshoot a lack of audio playback in iTunes:
iTunes and QuickTime for Windows: Audio does not play or plays incorrectly
http://support.apple.com/kb/TS1362
Take care,
Delgadoh

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