USB-UIRT windows driver installation fails

I'm having some difficulty getting the Windows drivers for the USB-UIRT device to install correctly.
In a nutshell, my living-room HTPC briefly had a USB-UIRT device connected and the drivers installed correctly. When I connect a different USB-UIRT device, rather than Windows using the already installed drivers, the New Hardware Found Wizard launches but fails with the error message "The system cannot find the file specified".
I'm trying to understand (a) why Windows needs to re-install the driver for a device that it already knows about and (b) why the driver installation is failing or at least how to get the drivers properly installed.
I wasn't sure if I could post JPG's in a message here, so I tossed up a quick web-page with some screenshots and the exact procedure I used at:
http://www.everlan.ca/uirt-drv
If anyone knows why the driver installaion is failing or can help, I'd really appreciate it.
Thanks in advance,
EverLAN
In a nutshell, my living-room HTPC briefly had a USB-UIRT device connected and the drivers installed correctly. When I connect a different USB-UIRT device, rather than Windows using the already installed drivers, the New Hardware Found Wizard launches but fails with the error message "The system cannot find the file specified".
I'm trying to understand (a) why Windows needs to re-install the driver for a device that it already knows about and (b) why the driver installation is failing or at least how to get the drivers properly installed.
I wasn't sure if I could post JPG's in a message here, so I tossed up a quick web-page with some screenshots and the exact procedure I used at:
http://www.everlan.ca/uirt-drv
If anyone knows why the driver installaion is failing or can help, I'd really appreciate it.
Thanks in advance,
EverLAN