Epson Stylus PHOTO 950 User Manual page 332

If EPUSBx: (EPSON Stylus Photo 950) is displayed in the Print
to the following port list box, then the USB printer device
driver and printer software is installed correctly. If the correct
port is not displayed, proceed to the next step.
3. Right-click the My Computer icon on your desktop, then
click Properties.
4. Click the Device Manager tab.
If your drivers are correctly installed, EPSON USB Printer
Devices should appear on the Device Manager menu.
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Troubleshooting