T&D RTR-500AW Introductory Manual page 30

2. Connect the Unit to the computer with a USB cable and look at
the icon displayed in the Device Manager window in order to
check whether or not the USB device driver has been properly
installed.
If the icon appears with an " ? "or an " ! ", the PC is not
properly recognizing the Unit.
Windows XP
3. If an icon for an "Unknown Device" appears, please re-install
the USB Device Driver by following the directions on the next
pages.
26 Getting Ready
In the System Properties
Window, click on the [Hardware]
tab.
Click the [Device Manager]
Button.
If successful (example)
If failed (example)
Windows Vista /
Windows 7