Which version of LW are you trying to install?

Which version of Java are you using? Do you only have one Java version installed on your computer?
If you've already updated your Java to the latest version, try this older version of Java 6 (if you're trying to install LW 5 then you'll need Java 6 & so the other older Java mentioned earlier in the thread will be no good): Archive: Download Java Platform Standard Edition (Java SE) 6u5
Install that Java, reboot & then see whether LW will install properly.

If you're trying to install LW 5 basic, you could try installing LW 4 basic & see whether you get the same error. You can download 4.18.8 from LW's older versions page: Lime Wire » Download Out-Of-Date Installers

If you have Pro, you can download 4.18.8 by clicking on the 'Get LW PRO Classic' link on the left of your personal download page.

Read this before installing an older version of LW: Just make sure that you have your current installer saved, because installing another version of LW will remove whatever you have installed at the moment. And if you have a Pro version which you can't update - you would lose that version!!

If you can install LW 4 without a problem, just try installing LW 5 & let it automatically uninstall LW 4... don't uninstall LW 4 first. See whether that makes any difference.

I've tried old and new versions of LimeWire BASIC, I've tried older & newer versions of Java.

Nothing is working. I've got the latest version of Java running right now and it was just updated a few hours ago. I tried going back to install LimeWire (with a shred of hope that it might finally work) and still nothing.

I appreciate all of the help you guys are giving, cuz I'm sure there are still people out there with this problem.

Trust me though, so far, everything you guys have mentioned, I've already tried, and nothing has worked so far.

Which version did you start seeing this problem with?