Chuck,
After I got your link I checked out the Video Grabber. It sounds like the software is from a different company and does not support the Hardware and vice versa. The software is the one having the issue with the USB right? Not the hardware!
Question is, when you plug the USB Video Grabber in, does the computer automatically recognise it, or does it ask for drivers to be installed?
From what I see, you could use other 3rd party Video Capture software that is compatible with the video grabber.
Robert