OK, I figured this out and am now able to access the Media folder in the web folder established by enabling the web server through control panel.
Follow the directions on this page using the rbindex file listed in 4b:http://www.roksbox.com/home/index.php?option=com_content&view=article&id=131&Itemid=54
place the rbindex in the web folder (I placed in the Media folder for good measure).
Direct the Video folder to Video (or whatever you have as the Video file under the web folder)
When the RoksBox setup wizard asks for the XML address, just click Finish.
You should be good to go after that.