Ok so you simply can't connect to the network. Something is blocking the port that LW uses. Most likely your modem/router. Probably your boss / network manager has blocked some ports.
1. Go to the Control panels & find the xp firewall & configure it as described
Firewall configuration instructions (click on link)
2. Open LW, go to LW's menu bar, select Tools > Options > Advanced > Firewalls & change both connection & listening ports to 64049