Had to re-download itunes, and now my ipod won't sync with new itunes without losing songs. how can I fix this

I had to get my computer fixed (had a virus), and everything was deleted off my hard drive. Now I've had to re-download iTunes, and I don't want to have to re-download all of the 1000 songs I have on my ipod, but I want to be able to continue to download new music onto my ipod from itunes.
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