This happened to my friends Ipod, I think you have to not sync your ipod to your itunes, i dont know how to do this, i know with mine, it isn't synched to my itunes so i can use it on other computers, but my friend did somethin to his and when he put his on my computer it deleted everything. you may have to start from scratch or something and re-install the software. thats the only thing i could think of.