Epson AcuLaser C9100 Reference Manual page 295

If EPUSBX: (EPSON AL-C9100) is displayed in the Print to the
following port drop-down 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.
2. Right-click the My Computer icon on your desktop, then
click Properties.
3. Click the Device Manager tab.
Troubleshooting
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