ok
here's how you do it. it's simple. this assumes you're on your new pc.
0. Don't install itunes just yet.
1. In Windows Explorer, go to Tools, Folder Options - View.
2. Select "Show hidden files and folders"
3. Click OK
4. Plug in your ipod
5. Browse to it in Explorer - you should see a folder called iPod_Control. In here is a folder called Music which has all your music in.
6. All the filenames will be messed up. Don't worry.
7. Copy the Music folder to your harddrive.
8. Install iTunes
9. Go into iTunes preferences and make sure "copy to library when importing" and "keep my library organised" are turned ON
10. Drag and drop your copied Music folder onto the iTunes window.