do a search from the start menu for a file you know you should have..
Something like B**tles - L*t It B*.mp3 and see where the search says the file is located. That is the most likely place that the rest of your files are located.
To put them on your iPod you will need to drag them onto a playlist so that they will transfer the next time you do a synchronize. Don't just drag them into the Library part of iTunes. You have to put them in a Playlist or they will not transfer to your iPod.
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