Epson AcuLaser C9100 Reference Manual page 297

If EPSON USB Printer Devices does not appear on the Device
Manager menu, click the plus(+) sign beside Other devices to
view the installed devices.
If USB Printer or EPSON AcuLaser C9100 appears under
Other devices, the printer software is not installed correctly.
Proceed to step 5.
If neither USB Printer nor EPSON AcuLaser C9100 appears
under Other devices, click Refresh or unplug the USB cable
from the printer, then plug it into the printer again. Once
you've confirmed that these items appear, proceed to step 5.
Troubleshooting
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