I need to get the music off my Ipod Nano 2nd GEN onto either ITunes or in a music foldes on my new computer. Not all the music was purchased from Apple Itunes HOW DO I DO THIS WITHOUT LOOSING ALL MY MUSIC??

I have not had a computer for several years and I just got a new one. My old computer got a virus and when that happened all my music was lost. Thank goodness I had it all on my Ipod Nano 2nd GEN. Now my problem is that I don't know how to get the music off my Ipod Nano onto my new computer!!! I was able to get the songs that I purchased thru ITunes by just authorizing my new computer. But I have alot more music that is on my Ipod nano that I can't put into my ITunes library. In fact, I can't even get my music into a file folder on my computer!! I really need help. I don't have any copies of the music anywhere else and some of it is hard to get. How do I get my music either into ITunes or into a file folder on my new computer or even if I could get my computer to recognize my Ipod and sync all the music into windows media or something like that. Every time I connect my IPod all that happens is that it tells me if I sync the IPod that it will replace all the music from my ITunes library on to my IPod. And I am guessing that means all my music on the IPod will be erased. PLEASE HELP ME!!!! Thanks from the bottom of my songsters heart