Epson LQ-590 Reference Manual page 117

If the USB device driver is not installed correctly, EPSON USB
Printer Devices may not appear. Follow these steps to run the
"Epusbun.exe" file in the CD-ROM that comes with your
printer.
1. Insert the CD-ROM in your computer's CD-ROM drive.
2. Access the CD-ROM drive.
3. Double-click the Win9x folder.
4. Double-click the Epusbun.exe icon.
3. Follow the on-screen instructions.
To reinstall a printer driver, see the Setup Sheet.
Printer Software
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