A little more information is needed here. The more information you can provide the better odds of figuring ot the problem.

OS Windows 98/2000/XP
CPU P4 3.0 GHz/AMD 64 3200+Ghz
Memory 256MB/512MB
Connection Dial-up/DSL
LimeWire Version 4.8.1/4.9.11
Java Version 1.4.2/1.5.4
What firewall you use if any
What Antivirus if any
Are you new to LimeWire or Experienced
An accurate description of your problem