u have to download some thingie that will reset your user acc and afterwards when u plug in your zune it will ask you if u want to connect as a guest. im not exactly sure of the name of the tool but if u look for it somewhere else google it cus this place sux seems like no one really answers anything but yea i do remmember something involbin the words zune reset tool if u look really hard you will find it try also searching under keywords turn off autosync, sign up as guest zune software ect. but there is a way i did it you can