I had been using LW (I forget which version) on XP Pro without a worry about a year ago, and have since installed XP MCE 2005.
I Figured I would get LW again, so I downloaded the newest one, installed jre-1_5_0_11, then installed LW, it went fine.
When I started it, it would show the splash screen, load successfully, show the main page, then immediately quit, leaving an icon in the tray which would disappear if I hovered the mouse over it.

The same thing happens with FrostWire aswell.
I have gone into the application data folder and deleted the LW folder, but it still quits when I try to start it.

I have spent about an hour looking on these forums for a solution, so this really is a last ditch effort.
Thanks in advance for any help you guys may be able to offer.

Edit: My pc specs are as follows:
CPU: AMD Athlon64 3500+ @~2.2GHZ
RAM: 512mb DDR2
GFX: nVidia 7300GS
Router: D-Link DSL-G604T