Same thing happened to me.

(I'm new here and have read loads of threads, this one is how my problem started, so I hope this is where I am supposed to post a reply. )

Then I uninstalled, disk utility repair, restart.
Went to the OSX Firewall instructions posted by Lord of the Rings, downloaded the Java 5.0 but I couldn't load it as the hard disk had a red exclamation mark.
I then downloaded limewire once again - this time when I double clicked on the dmg I got the message "not recognised" !
Have no idea where to go from here.
Hope someone out there has an idea for me.
Thanks in advance
Matilda

These are the answers to the questions.

Mac OSX 10.4.8
Only firewall ticked is Gnutella/Limewire
768 MB DDR SDRAM
18.11 GB available HD space
Broadband
Linksys ADSL Gateway AG041- UPnP is enabled. Administration port is 8080
This model isn't listed in the link Grandpa listed.
Connecting from home
Trying to open latest version of Limewire - doesn't get recognised
Java 1.4.2 plugin setting
Java 1.3.1 plugin setting
Java15 release 1. dmg - can't install
Internode is my service provider
it says "your test worked"
Not sharing with other computers
New problem, an experienced user using other versions of limewire now deleted
yes I saw the blue brick wall
I don't have any anti-spyware, or ant- virus programs