I have to gripe about something. People keep redirecting forum users to use WIN XP to update the firmware in their Zen Vision M's. I really don't think this is necessary, provided the computer is recognizing the player. The problem with WIN 7 is that the driver that is necessary for the PC to interface with the Zen does not always intialize when the players is first plugged in.
If your PC recognizes the player, and you will know this when you are able to sync music, you will be able to update the firmware, unless the player is broken.