I need help for my 1st gen. MBA. During I sync-ing my iPhone4 with the iTunes also in the process of upgrading to 10.5.3, it prompted me to restart the system and I pressed the button. After the restart, the iTunes and iPhoto could not launch properly. They simply gave me a pop up box stating that iTunes/iPhoto quit unexpectedly. Here is an extract of the message:- Process: iTunes  Path: /Applications/iTunes.app/Contents/MacOS/iTunes Identifier: com.apple.iTunes Version: 10.5.3 (10.5.3) Build Info: iTunes-10530301~1 Code Type: X86 (Native) Parent Process: launchd  Date/Time: 2012-02-15 22:07:28.050 +0800 OS Version: Mac OS X 10.6.8 (10K549) Report Version: 6 Interval Since Last Report: 966 sec Crashes Since Last Report: 13 Per-App Crashes Since Last Report: 2 Anonymous UUID: F154F626-0EFE-4307-9872-BE92D476028E Exception Type: EXC_BAD_ACCESS (SIGSEGV) Exception Codes: KERN_PROTECTION_FAILURE at 0x00000000bf7ffffc Crashed Thread: 0 Dispatch queue: com.apple.main-thread Thread 0 Crashed: Dispatch queue: com.apple.main-thread 0 libobjc.A.dylib 0x9296699a classHash + 18 1 libobjc.A.dylib 0x9296642e NXHashGet + 32 2 libobjc.A.dylib 0x92966cd4 look_up_class + 134 3 libobjc.A.dylib 0x929672eb connect_class + 112 4 libobjc.A.dylib 0x9296731e connect_class + 163 I tried a number of suggested solutions based on other previously forum discussions such as deleting .plist files and removing iTunes and reinstalling it but they did not work. Could someone give me some advice what should I do? I would very much appreciate!!