I'm stumped. Have you checked to see if any OSX updates? Have you repaired permissions after a safe boot? SAFE Boot & Repair Permissions
So LW 5 installs but the actual program as a cross through it? I'd have thought your imac would be ok. Perhaps a problem with the original OSX installation which I believe is what my problem was. I think mine needs a fresh install wiping drive at same time. I did archive installs last year to no avail for LW 5. But my LW 5 works fine in a different OSX installation on a different drive.
Only answer I can think of is downgrading to LW 4.18. To do that you will need to remove install limewire.pkg file from the Receipts folder. Receipts folder sample image

What happens with LW 4.18 & 5 on my main OSX: http://www.gnutellaforums.com/attach...-dead-nail.gif; not even a multi-bounce, simply dead.

I have done all this java 6 is at the top of the list im using OSX 10.5.6

I have a 64 bit intel machine i am downloading the limewire 5 installer for my operating system and it still isnt working as far as i can see this is the only program which does this and wont work but will install..

Is there anyway you can find out more without me having to downgrade because i have heard great reviews about the new one i will use the older version now as it is all i have

Thanks anyway