Connections is not my strength so I'm hoping others members will join in on this. To allow access for LW thru XP's firewall see:
http://www.limewire.com/english/content/firewalls.shtml
As for SP2 See:
SP2 & Limewire: relax 3rd party Patch & methods & if necessary also
MS SP2 Patch I don't know the difference.
For Norton AntiVirus see:
Norton Clearance for LW
Java autoupdate:
http://www.java.com/en/download/windows_automatic.jsp
Connecting from the dorms at university is a common problem people have nowadays b/c more & more colleges are blocking p2p due to them using up too much bandwidth & total dwnld quantity (colleges pay big money for it.) It's also not new to hear that one person can obtain access but others can't in a dorm.
I have a suspicion & I could be wrong, but it may be a situation where a particular port is open but only to one computer according to the way the router works. If that's so it's a router issue. How to combat it, my guess would be to try alternative ports. But if you're going to try alternative ports you'll also need to allow access to them on your xp firewall & change the port setting you've chosen within LW itself. LW's menu Tools-Options-Advanced & Port & Firewall. You probably also need to force ip.
Alternate Port Selection:
This thread OR
That thread.
If you connect, try not to dwnld too many files simultaneously.