Do you mean that LW won't open?

What version of Java are you using? Try this one instead. Use the JRE offline installer & remove your current version of Java before you install this one.
Archive: Download Java 2 Platform Standard Edition (J2SE) 5.0 Update 11

Reinstall LW & make sure to use the offline installer (not the recommended one).
Lime Wire » Download LimeWire

If that doesn't help, delete LW's preferences folder when LW's properly closed. See point 3 here & also point 2 if you've used older versions of LW in the past (there could be a folder in either location).
Fixes for LimeWire
This will kill all of your settings within options, you'll have to go back through afterwards & reset things. If you're not sure of your settings, go through LW's tools > options & write them all down, so that you can reset things later.

Otherwise, try the other fixes in that thread