Your comments

Enrique:

I have disconnected the ROKU device from the network (even though it was attached to the router by cable), rebooted the router and tried the transfer again. Unfortunately, I got the same result: "Unable to located the device selected".

What else could I try? I would not want to purchase a new router as the present one meets my requirements.

Thanks.
I use a Belkin G-Router. Admittedly, it is a bit old and I have not updated the firmware in quite a while. The following devices are connected to my wifi network: Laptop computer (Windows XP SP3), Roku, iPhone4, iPad. I use WPA security.