I had the same problem and i followed what you said Birdie, but then I tried starting up Limewire by using the Desktop icon, and it ran me through the steps like normal to start up and i clicked Finish. It didnt start up directly after me clicking Finish, so i double clicked the icon again and it did the same thing as before, which is that it stops at 56% loaded and then dissapears and nothing happens. I tried clicking Run As... and i started it and got this message:

Limewire could not create a temporary preferences directory.

This is generally caused by a lack of permissions. Please make sure that LimeWire (and you) have access to create files/folders on your computer. If the problem persists, please visit Lime Wire » Official Website & Free Download « and click the 'Support' link

Limewire will now exit. Thank You.
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I've already been to this post: http://www.gnutellaforums.com/genera...wont-open.html and this one too: http://www.gnutellaforums.com/genera...not-start.html, but nothing worked. I haven't tried what North450 said, should I?