In XP you can assign drive letters in Administrative Tools/Computer Management if you have Administrator status. Go to Disk Management and right click on a drive and you can assign the letter it will use. I would be inclined to remove the multireader, install the Panasonic drivers, then the Panasonic reader, a card and use Jukebox etc. Then plug the multireader in again. The multireader will use native Windows drivers so hopefully this way they won't interfere with the CB7.