Ok, you own a zune, if you hook up your zune to another computer it will ask you if you want to sign on as a guest, and it wont erase your music. Only Ipod do that stupid erase your content crap. Best thing to do is get an external hard drive and keep all your music and video on it. this way if you switch computers(or god forbid get a virus) you still have all your music. If i were you i would just go get an external hard drive boot your old computer up one more time and transfer all the music to your external, plug it into to new computer change the zune software to monitor the external for music, plus it will also keep your new computer free of cluter