On Windows 7 PC, got the "upgrade iTunes" notice, said sure, but the upgrade failed, now I can't access iTunes "invalid permissions"

On Windows 7 PC, got the "upgrade iTunes" notice this morning, said sure, but the upgrade failed, now I can't access iTunes "invalid permissions"
I wasn't paying attention so I don't know the precise error I got on the upgrade failure.
All other iTunes upgrades have been fine...no brainers.  Done several on this W7 PC.
If I re-download and install a fresh iTunes I assume I will lose my library...true?  Can I find and save off my library so I don't have to "discover" all my music which is scattered all over the PC and a 1T attached USB drive.
Or is there some way to get the iTunes upgrade to successfully restart and install correctly?
Help!

Hello there, Konami84.
The following Knowledge Base article provides some recomendations for troubleshooting:
iTunes 11.1.4 for Windows: Unable to install or open
http://support.apple.com/kb/TS5376
Check for .dll files
Go to C:\Program Files (x86)\iTunes and C:\Program Files\iTunes and look for .dll files.
If you find QTMovie.DLL, or any other .dll files, move them to the desktop.
Reboot your computer.
Note: Depending on your operating system, you may only have one of the listed paths.
Uninstall and reinstall iTunes
Uninstall iTunes and all of its related components.
Reboot your computer. If you can't uninstall a piece of Apple software, try using the Microsoft Program Install and Uninstall Utility.
Re-download and reinstall iTunes 11.1.4.
Thanks for reaching out to Apple Support Communities.
Cheers,
Pedro.

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