HT201413 upgrading from version 10- now i cannot use iTunes at all!

I downloaded the most recent iTunes software (upgrading from version 10) and now I cannot use iTunes at all! Upon opening iTunes, it says that "an unknown error occurred (-45054)". If i click "ok" itunes immediately closes itself...what do I do??

Hello KarmaThaPilot,
I located an article that may help you with the issue you're experiencing. Take a look under that heading titled "Using the Repair Privileges Utility."
Troubleshooting permissions issues in Mac OS X
http://support.apple.com/kb/ht2963
For Mac OS X 10.2 or later, open Disk Utility (/Applications/Utilities/). Select your Mac OS X startup volume in the column on the left of the Disk Utility window, then click the First Aid tab. Click the Repair Disk Permissions button.
Before performing maintenance such as repairing disk permissions, it's always best to perform a backup of critical files.
Mac OS X v10.5, v10.6: How to back up and restore your files
http://support.apple.com/kb/ht1553
Thank you for contributing to Apple Support Communities.
Cheers,
BobbyD

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