1. Do you have LimeWire 4.9.11 installed?? PRO or Basic?
2. Do you have JAVA 1.5 installed ? You should if you have 4.9.11.
3. Do you have a router? If you are on a Home Network, you need to configure your router to use both TCP and UDP connectivity.
4. What Firewall are you using? You do have a firewall, don't you?
5. Have you allowed all necessary permissions for it?
6. If you are using WIN XP, have you or are you, current on all your updates?
7. Have you defragged lately? This will allow a more efficient "write" to you HDD.
8. Do you have sufficient space on your HDD?
9. Are you on Dialup, DSL, Cable or what?

A lot of questions but these can help resolve your problem.

Let us know.