It might be an idea to use your add/remove programs control panel to remove Java. Then downld the "Offline" version to your computer & then install it. Also delete your LW preferences. See points 1-3 here Fixes for Limewire

Also see this link as it might apply to you: 1. See The way to fix the Blank screen on startup, & also this one 2. GeoForce 3D setting

Also if you have a very large amount of incomplete files then consider doing this Tip: Purge the Downloads Queue! as it generally gives LW a fresh breath of life.