Q: iTunes error 13014

tech support helped me with this exact issue:  unknown error (13014).  They had me shut down cold, then reboot via the power button, then holding the shift as soon as I heard the apple boot up sound.  Released the shift key when I saw the apple logo.  Takes a while to repair / start back up.  Apparently, it's in safe mode when it reboots so the graphics were distracted and everything was in question marks.  I shut down cold again. Rebooted and was good to go.  YAY!

hi, the anti virus was the problem. Once removed it worked.

like this: http://www.coopoint.com/articles/how-to-fix-itunes-error-13014