Go through these suggestions one by one, hopefully something here will help!

1. First of all, try uninstalling both LW & ZA. Rinstall LW first & after that, reinstall ZA...that's been a fix for a few Vista users.
Make sure that LW is allowed through the ZA firewall.

2. Make sure that there's not a Windstream firewall causing problems. Read post #7 of this thread (click on link) & see how another Windstream user fixed their problem!
Archive: Download Java 2 Platform Standard Edition (J2SE) 5.0 Update 11

3. Try using this older version of Java. Download the JRE offline installer, remove any other Java versions & then install this version.
Archive: Download Java 2 Platform Standard Edition (J2SE) 5.0 Update 11

4. Try deleting LW's preferences folder when LW's completely shut down. If that doesn't help, delete LW's preferences folder when LW's properly closed. See point 3 here & also point 2 if you've used older versions of LW in the past (there could be a folder in either location).
Fixes for LimeWire
http://www.gnutellaforums.com/genera...der-vista.html
This will kill all of your settings within options, you'll have to go back through afterwards & reset things. If you're not sure of your settings, go through LW's tools > options & write them all down, so that you can reset things later.

5. Double check your port forwarding. Or remove the port forwarding rules that you've set up, then add them again. Here are the instructions for your router.
Port Forwarding for the Efficient(Siemens) Speedstream 5200