Hello,
The previous responder is correct, more information is needed. However, I have some ideas that are general and might help. Whether it is helpful or not will depend on the extent of your problem.
Make sure you are connected and have a relatively strong connection. Click over status bar on the bottom of page and it will tell you the strength of the connection. You can always go to file and click disconnect and then reconnect to lime wire (click the connect button under file) after a few minutes or if/when computer is restarted.
If you have the firewall icon showing click on it to find out your status. If it is blocked apply lime wire to your exceptions list under your security settings (or the equivalent from a different setup).
***Make sure you have all the latest downloads- especially Java. Download the latest version from java.com and verify that java is enabled by your browser. Do this by opening your browser, click tools, content, and make sure the box next to "enable java" is checked.

...Just some tid-bits of information you may find useful now or in the future. Best of luck.
w642lisa