Epson STYLUS PRO 4400 Reference Manual page 326

If EPUSBX: (EPSON Stylus Pro 4400) or EPUSBX: (EPSON
Stylus Pro 4800) appears in the Print to the following port list,
then the USB printer device driver and printer software are
installed correctly.
If the correct port is not displayed, proceed to the next step.
4. Click the Device Manager tab.
If your drivers are correctly installed, EPSON USB Printer
Device should appear on the Device Manager menu.
If EPSON USB Printer Devices does not appear on the Device
Management menu, click the plus (+) sign beside Other
devices to view the installed devices.
326 Problem Solver
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