I am operating OS X 10.3.9. I have been successfully using Limewire Basic for at least a year on this same system. Now, all of a sudden, Limewire will not open. I did download a few of Apple's newest software upgrades (just a few of the ones that were already operating on this system). One of the upgrades, which was done separately, was the newest iTunes 6. A day before that Limewire was smooth. Could the latest iTunes block out Limewire in order to get me to purchase their music? I did run the test that has been suggested, it worked. I did look at my firewall settings and changed them, no luck. Should I just trash the limewire already there and reinstall? And if I do this, will I lose my library? These files will still be in the Shared folder on my hard drive, right? Please help!

If you recently updated Quicktime to 7.0.4 then see point 3 below. If not then do the other steps.

1. It sounds like the OS update did the damage. Normally after installing Softw or updates, it's best to repair permissions. ie: Restart whilst holding down the SHIFT key until you see the window saying, Safe Booting. Then once started, go to Utilities folder, open Disk Utility & repair permissions. Then reboot normally.

2. I would suggest you re-install Java using the "Offline" java installer. Try this one: http://www.apple.com/downloads/macos...update142.html
If it refuses to install & gives you a "null" error, go to the harddisk drive, open Receipts folder, & remove/trash the last Java 1.4.2_update2.pkg package & try again to install java. See Receipts folder sample image

3. BTW if you installed QuickTime 7.04, then uninstall it & go back to an earlier version. QT 7.04 has a severe bug versus Java. See QuickTime 7.0.4 bug stops LimeWire from opening!