If you still have your old iTunes from the computer you were using before, you can back up from that iTunes, and then import into your new computer. You can back up to disk, that's what I've used a few times, it's easy to do, but it takes awhile.
You could also opt for the very easy but costly method of buying a program such as iPubsoft iPad iPhone iPod to PC Transfer. I bought it awhile back when my computer crashed but I still had all my music, playlists, ratings etc. on my iPod.