update - tried it again in my laptop (which runs Vista, PC runs XP) and I can see the drive in the device manager under disk drives. It says it's working, but I'm still not getting any drive to select to access the files. When I use the device manager to view information about the drive, and ask it to populate the volumes, it can't find any volume information on the drive. When I use the computer management -> disk management window the drive doesn't show up at all.
It's frustrating that it comes up on one list and not the other, and I can't access it in any way!