ITunes won't open, says files are missing. reinstall?

I've been using iTunes for a couple years now today I can't open it. A message keeps popping up saying I need to reinstall iTunes due to files missing. Is there a way to do a "repair install" What do I need to do to not loose all of my music.

You should not loose any music if iTunes was maintained properly.
In most cases it is so no need for concern. But to verify.
Go to My documents - My Music - iTunes - iTunes Music - Inside this folder you should see all your music, videos, podcasts, etc.
If you get the chance right click on iTunes Music folder, select properties. This will show you the file size. The file size should be pretty big depending on how much music you had.

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