Epson LX 300+II Reference Manual page 90

Correcting USB Problems
If you are having difficulty using your printer with a USB
connection, read the information in this section.
Make sure that your computer is a Windows 98, Me, 2000, or
XP pre-installed model
Your computer must be a Windows 98, Me, 2000, or XP pre-
installed model. You may not be able to install or run the USB
printer driver on a computer that is not equipped with a USB
port or that has been upgraded from Windows 95 to Windows
98, Me, 2000, or XP.
Make sure that EPSON USB Printer Devices appears on the
Device Manager menu (in Windows 98 and Me only)
If you canceled the plug-and-play driver installation before the
procedure was complete, either the USB device driver or the
printer driver may be incorrectly installed.
Follow these steps to check the installation and reinstall the
drivers:
1. Turn the printer on, and plug the USB cable into the printer
and the computer.
2. Right-click the My Computer icon on your desktop, then
click Properties.
3. Click the Device Manager tab.
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Maintenance and Troubleshooting