Pressing a scanner button does not, Start the correct program – Epson Perfection V500 User Manual

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If a USB Universal Host Controller and USB Root Hub are listed, Windows supports
USB.

Try scanning again. If your scanner still is not recognized, contact Epson for assistance.
See

for details.

Pressing a Scanner Button Does Not Start the Correct Program

Make sure Epson Scan and Epson Event Manager are installed correctly. See the Start

Here sheet for instructions.
Make sure your Windows system is set up for scanner events as follows.

Windows Vista:

Click

> Control Panel > Hardware and Sound > Scanners and Cameras, or