Reinstall iTunes?

I updated for 8.1.1 iTunes, but everytime I try to open iTunes now it gives me "iTunes cannot run because some of its required files are missing. Please reinstall iTunes."
How do I reninstall iTunes? Do I have to redownload it?
(My iTunes folder only has [Run iTunes]&[About iTunes] in it)
Thanks for any help!

I Have the exact same problem....What is this crap.
I upgraded itune to 8...and now when i go to open/load the program. setup doesnt work- it stated to rininstall itune.
please help
My question: if I reinstall it, would it erase my itune library? and how to back it up???
[email protected]

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