Did you Repair it whilst LW was closed (MUST be closed)?
Can you give us some background info about your computer:
1. OS version?
2. What firewalls you have?
3. ram? 4. HDD space available?
5. Connection type?
6. Modem & router brand name & model numbers?
You you tried deleting LW's preferences whilst LW was closed & it didn't work?
WHich version of Java do you have on your system? My suggestion to update your Java
version 1.4.x OR
version 1.5 (take the JRE) Java is very important for LW & the network.