Can you please describe how your LW shuts down? For example: "When I start LW it shut down right away", or: "Its shut down 1 hour after using". That will help us a lot.
And, there is an error log in your LW directory. Try to start LW, then after its shut down, try searching that error log, and post it here. That error log has date written on it so it will be easy for you to navigate and find it.
It is very important to post it here; it wouldn't call "Log" if there is no use for it
Check from Add/Remove programs, from Control Panel, how many Java versions do you have. Tell us that, also.
Thanks.