Who is your ISP?
What's the model of your Speedstream?
Are you port forwarding, or is UPnP enabled on your modem/router (which one)?

Make sure that the XP firewall's allowing LW.
User Cant Connect - LimeWire

In LW go tools > options > advanced > firewall config. change LW's listening port to something in the range of 49152 - 65535 (eg 65000) > apply > ok. If you have port forwarding set up for your modem/router, you'll need to change the port number forwarded within your router's setup pages so that it's the same as the new listening port.

Did you try the fixes suggested here?
If LW Will Not Connect

Remember that LW has to be properly closed before replacing gnutella.net or deleting the preferences folder(s). Also remember to have only 1 version of Java installed on your computer.

Did you update Windows Defender just before you stopped being able to connect?