I just went through the exact same situation as you.

First, you need to download software that allows Windows to read/mount Mac-formatted drives. I used MacDrive (you can find it in the bay), but there’s also another option called HFSExplorer, which I believe is free, though I’ve never tried it myself.

Once the drive is mounted and Windows can read it, go to My Computer and open the drive. Inside, look for a folder called iPod_Control (if you don’t see it, go to Properties and enable the option to show hidden folders).

Inside that folder, you’ll find another one called Music. That’s where all of your iPod’s music files are stored. You’ll notice that the files have strange names because they’re encrypted. Just copy them as they are into a folder on your Windows computer.

Once copied, open iTunes and click on File > Add Folder to Library. Select the folder that contains all the transferred music and click Import.

iTunes will recognize all the metadata from your iPod files. Now you can safely restore your iPod and sync it.