Well, first off, what are your specs?

I assume you're using OS 9, since you're not posting in the OS X section. Try giving more RAM to Limewire as well as to Java MRJ or Java Runtime.

What error message number do you get what Limewire unexpectantly quits?

In response to your P.S.:

This is a support forum. All the people here have problems. Tens of thousands of people use Limewire successfully without any problems ever. We have a hundred here, maybe, maximum, at any one time. You really shouldn't judge the value of the program by looking at these forums, because you are specifically looking at the place where problems are diagnosed and hopefully resolved.