Fuze charges but is not recognized by Vista.

When I plug my fuze into the usb port it will charge but it isnt recognized by my computer.  When it is plugged in I can use the player normaly like listen and browse my music.  I have tried setting the usb mode to mtp, msc and auto detect to no avail.  I haven’t tried formatting yet because while I dislike not being able to change my music on my fuze I would hate to have nothing on it and not be able transfer anything to it. 

Thanks in advance.