Computer Won't Recognize My Floppy Disks

Ezzie Bromwich from Rapid City, SD writes: I recently bought USB port Diskette Drive and tried to do my disks that I started with in 2004 Is there something I should do to play them? It does not seem to recognize the items on the disks. As a genealogist I have several items on them I would like to get at. Can you advise me on what to do? I have Windows 7 on my puter. Thank you.