Go to Start > Settings > Printers & Faxes
(That's for XP. Other versions of Windows might require you to go via 'Control Panel' or to 'Devices and Printers').
Right-click on the icon for your printer.
Select 'Properties' (or 'Printer Properties')
Click on the 'Ports' tab.
Scroll down to 'EpsonNet Print Port' and click to place a tick alongside it.
Click 'Apply'
Click 'OK'