Hi Jimmy_T,
You'll need to give a good description of your system:
OS (yep, you've said WinXP)
LimeWire & Java versions
Connectioin type (ie modem, cable/dsl etc)
Where you're connecting from ( home, work, school)
Modem/Router brand & model numbers
Any firewalls that you're using

Until someone gets back to you with a reply, have a look at all the stickies around, they might give you a few ideas