Creative Zen X-Fi 8gb wont play, and doesnt show up on my laptop

Wanted to put some nice tunes into my zen yester day. When it was plugged i changed the program from Windows Media Player (works with Zen but not that good), to Creative Media Centrale while it was plugged in the USB. When i went last night it wouldt turn on, it shows the Creative and the ZEN logo and then says "Rebuild" or something (my is in danish), and when it reaches the las 10% it turns to that dark blue screen, and then i have to press the Reset button to get any reaction.

I need music sooooooo much