I am unable to use my iTunes on my G4 OSX (using version 10.8.2). I continually get the unknown error message -200. Despite running Diskwarrior ( so I know my hard disk is clean), and clearing my iTunes library files and com.apple.itunes.plist and restarting, I still have the error message. I know I could reload the original software by totally relaunching my system, but can anybody help me avoid having to do this. It's only the iTunes that is the problem.