See here for how to convert your iPod to FAT32:
http://rockbox.org/wiki/IpodConversionToFAT32You don't have to post your email address in every reply, we can see it in the "email" link under your name.
EDIT: If the install fails, or you just don't like Rockbox, you can boot into emergency disk mode, then do a "restore" with iTunes (note this will format the player, removing all music). With what the Rockbox install procedure does, it is not possible to brick the iPod, it just may require restoring to bring it back to a workable state.