I have this error that i cannot fix and i have no idea what causes it

I downloaded and installed a version of the JDK (version 1.3 actually) and something in the software had a bug that would not recognize java command line class files. i would try to run a perfectly good java class that works on other computers and i would get this error:
Exception in thread "main" java.lang.NoClassDefFoundError: (name of class)
I tried uninstalling and reinstalling a copy of the JDK that i know works because I've installed it on other computers, and that didn't work. I wanted to email java tech support but they have no such thing. I need to have this working because I am taking a class on java and it is rather annoying to not be able to do assignments on my own computer. i can run applets fine, but i also can't compile properly. it gives me errors for compiling (again, testing on another computer). Another error is when I compile a program that imports classes it does not recognize the "import" declaration and does not compile the program since it does not recognize any of the outside references.
Also i got the JKD through another website, but it was linked to sun's website. I burned it onto a cd and installed it from there. If anyone knows what my problem could possibly be, and how to fix it, please let me know.

OK, i tried fixing the classpath but that did not help. It's not the class name because i know you're supposed to type "java ClassName" if the name of the class is ClassName. I also cannot compile a program that calls other classes, because I get a compiler error that they can't be found. My latest error is in compiling an applet and the setBackground and setSize methods can't be found. Yes, i am importing java.awt and java.applet.Applet.
I have a suspicion that the problem may be in a .dll file (i know it sounds nutty but i found the name of the file once and I can't find the file again. ). again, if anyone knows what the problem could possibly be let me know.

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Try updating directly on the device, via iTunes on the computer, and iTunes on a different computer.
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Nope!
When posting in Apple Communties/Forums/Message Boards.......It would help us to know which iMac model you have, which OS & version you're using, how much RAM, etc. You can have this info displayed on the bottom of every post by completing your system profile and filling in the information asked for.
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Tien
Tien P.
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I get an disk utility premission error that it cannot fix

I get this error from disk utility
any help is appreciated
Tim
Repairing permissions for “iMac”
Reading permissions database.
Reading the permissions database can take several minutes.
ACL found but not expected on "private/var/root/Library/Preferences".
ACL found but not expected on "private/var/root/Library".
ACL found but not expected on "private/var/root".
Permissions differ on "System/Library/CoreServices/Front Row.app/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
Permissions differ on "System/Library/CoreServices/Front Row.app/Contents/PlugIns/DVD.frappliance/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
Permissions differ on "System/Library/CoreServices/Front Row.app/Contents/PlugIns/FRSettings.frappliance/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
Permissions differ on "System/Library/CoreServices/Front Row.app/Contents/PlugIns/FRSources.frappliance/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
Permissions differ on "System/Library/CoreServices/Front Row.app/Contents/PlugIns/Movies.frappliance/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
Permissions differ on "System/Library/CoreServices/Front Row.app/Contents/PlugIns/Music.frappliance/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
Permissions differ on "System/Library/CoreServices/Front Row.app/Contents/PlugIns/Photos.frappliance/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
Permissions differ on "System/Library/CoreServices/Front Row.app/Contents/PlugIns/Podcasts.frappliance/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
Permissions differ on "System/Library/CoreServices/Front Row.app/Contents/PlugIns/TV.frappliance/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
Permissions differ on "System/Library/PrivateFrameworks/BackRow.framework/Versions/A/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
Permissions differ on "Applications/iTunes.app/Contents/CodeResources", should be -rw-rw-r-- , they are lrw-rw-r-- .
Permissions differ on "Applications/iTunes.app/Contents/Frameworks/InternetUtilities.bundle/Contents/ CodeResources", should be -rw-rw-r-- , they are lrw-rw-r-- .
Permissions differ on "Applications/iTunes.app/Contents/Resources/iTunesHelper.app/Contents/CodeResou rces", should be -rw-rw-r-- , they are lrw-rw-r-- .
ACL found but not expected on "Applications/QuickTime Player.app/Contents/PlugIns".
Permissions differ on "System/Library/CoreServices/RawCamera.bundle/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
Group differs on "private/etc/cups", should be 0, group is 26.
Permissions differ on "private/var/spool/cups/cache/rss", should be drwxr-xr-x , they are drwxrwxr-x .
Permissions differ on "System/Library/PrivateFrameworks/iLifeMediaBrowser.framework/Versions/A/CodeRe sources", should be -rw-r--r-- , they are lrw-r--r-- .
Permissions differ on "System/Library/PrivateFrameworks/iPhotoAccess.framework/Versions/A/CodeResourc es", should be -rw-r--r-- , they are lrw-r--r-- .
Permissions differ on "System/Library/PrivateFrameworks/iPhotoAccess.framework/Versions/A/Resources/P lugins/BlackAndWhiteEffect.IAPlugin/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
Permissions differ on "System/Library/PrivateFrameworks/iPhotoAccess.framework/Versions/A/Resources/P lugins/CubeTransition.IAPlugin/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
Permissions differ on "System/Library/PrivateFrameworks/iPhotoAccess.framework/Versions/A/Resources/P lugins/DissolveTransition.IAPlugin/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
Permissions differ on "System/Library/PrivateFrameworks/iPhotoAccess.framework/Versions/A/Resources/P lugins/DropletTransition.IAPlugin/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
Permissions differ on "System/Library/PrivateFrameworks/iPhotoAccess.framework/Versions/A/Resources/P lugins/FadeThroughBlackTransition.IAPlugin/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
Permissions differ on "System/Library/PrivateFrameworks/iPhotoAccess.framework/Versions/A/Resources/P lugins/FlipTransition.IAPlugin/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
Permissions differ on "System/Library/PrivateFrameworks/iPhotoAccess.framework/Versions/A/Resources/P lugins/MosaicFlipTransition.IAPlugin/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
Permissions differ on "System/Library/PrivateFrameworks/iPhotoAccess.framework/Versions/A/Resources/P lugins/MosaicFlipTransitionSmall.IAPlugin/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
Permissions differ on "System/Library/PrivateFrameworks/iPhotoAccess.framework/Versions/A/Resources/P lugins/PageFlipTransition.IAPlugin/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
Permissions differ on "System/Library/PrivateFrameworks/iPhotoAccess.framework/Versions/A/Resources/P lugins/PushTransition.IAPlugin/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
Permissions differ on "System/Library/PrivateFrameworks/iPhotoAccess.framework/Versions/A/Resources/P lugins/RevealTransition.IAPlugin/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
Permissions differ on "System/Library/PrivateFrameworks/iPhotoAccess.framework/Versions/A/Resources/P lugins/SepiaEffect.IAPlugin/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
Permissions differ on "System/Library/PrivateFrameworks/iPhotoAccess.framework/Versions/A/Resources/P lugins/TwirlTransition.IAPlugin/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
Permissions differ on "System/Library/PrivateFrameworks/iPhotoAccess.framework/Versions/A/Resources/P lugins/WipeTransition.IAPlugin/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
Permissions repair complete

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