As I mentioned above, do not attempt to uninstall LW using the add/remove control panel. To find out version, go to Help menu -> About LW. Reinstalling will also uninstall LW at the beginning of installation process.

Could be an problem with your java for your issues (which is very common). You could try this re-installation technique: http://www.gnutellaforums.com/333278-post2.html