System restore

I got a nasty virus and had to restore my computer, all of my music is on my 30gb  Zune but once I reinstalled the zune software it tells me my zune is connected to another computer,  I was hoping to use the zune as a back up for all my pix and music (16gb). I don't want to lose everything, how do I make the zune realize that it connected to the same computer? Please help.

just sign up as guest that is the best that way u can actually erase the music off from your pc without the zune-music deleting from your device that will save up pc-disk space