How to repair sansa player c200?

Hi there, anyone know how to repair a sansa player (C200)... I had a brain-fart today! I connected it to a friends laptop (+Vista) to swap some tunes and after offloading I formated my sansa -via Vista format- now its working all funky and wont be recognized as sansa by my PC... It's got the latest firmware, and tried to format it via sansa settings, but it just hags/freezes!

Any help would be greatly appreciated!