Did you try rolling back your Java version (some people have had connection problems after installing the last 2 Java updates) & deleting LW's preferences folder??

If the test page can't be displayed, something's blocking LW's default port. Could be your ISP? Change ports. In LW tools > options > advanced > firewall config. Change LW's listening port to 64049 (if that doesn't help, try other ports in the range of 49152 - 65535) > Apply > ok.

Double check that your XP firewall's allowing LW.
User Cant Connect - LimeWire

Also check that you don't have a Windstream firewall running...this Windstream user had a problem with their firewall.
http://www.gnutellaforums.com/connec...t-connect.html

Try port forwarding for your Speedstream, the instructions are here.
Port Forwarding for the Efficient(Siemens) Speedstream 5200
Don't forget the step of setting up a static IP address first. LW's listening port, port in the 'manual port forward' box & port forwarded within the router all have to be the same number