I have the same model (I think, it looks just like yours anyway) I have found that many media player programs don't like it.
Windows Media Player 11 seems to like it, though. Make sure you have the latest version of WMP.
All is not lost if it still woun't work, though! Windows XP SP2 likes it just fine! Simple plug it in (without WMP running) and Windows XP will install it as a removable drive. All you do then is copy your music directly onto the player like you would if it were a flash drive.
If it just plain won't work, then I fear it may be broken.
Is this your player:
Edited by Amazing Andrew, 04 July 2007 - 05:58 PM.