Can you tell us your details, please?
System details - help us to help you

Try this to fix the dark screen thingie:

1. Update your Java. Use the JRE offline installer & remove your current Java version before you install the new one.
http://java.sun.com/javase/downloads/index.jsp

2. Delete LW's preferences folder when LW's properly closed. See points 2 & 3 below. This will kill all of your settings within options, you'll have to go back through & reset things afterwards.
Fixes for LimeWire