I try to update my iTunes to version 11 but every time I open iTunes after the restart it shows me an error message that states, "An Unknown Error Occurred (-42408)". The same thing happens when I try to install it using the stand alone installer from the apple website. iTunes still opens but remains as version 10.7 (21) and dosent update. I have tried this numerous times and I keep getting the same results. I have also looked all over online but none of them give me a solution that works. My system is a MacBook Pro (15-inch, Mid 2012), OS X Mountain Lion (10.8.2) Thanks.