This is very strange. I have never heard of this happening to anyone yet, and believe me - I've heard a lot. Well.... here are some more questions I'll ask to help figure this out:
Did LimeWire do this with any other previous version?
Exactly which version are you using right now?

Maybe Clean LimeWire will work for you?
Try the beta version...(the 2.1.1 version)
http://www.geocities.com/burk017/testprog.html
If you get the same error, then the bug is a result of a bad piece of code. If not, you might need to re-install JRE 1.3.1.

Did any of this help?
:-)