Using Windows XP Home with laptop and desktop. Printer is connected to desktop with USB and is shared with laptop. Every now and then laptop no longer can print. When I check ip settings, find out that ip address has changed on the laptop or desktop or both. Have to go into Zone Alarm firewall and re-configure trusted addresses again so that printing for laptop works again. It’s a pain! Have shared printers with other laptops and this has never happened. Cannot figure out how to keep this from happening again. Need advice.