What if the itunes file is gone, computer crashed? Have titles, no content?
What if the itunes file is gone, computer crashed? After reloading itunes have titles, no content?
Windows XP Pro, HP Laptop
It has always been very basic to always maintain a backup copy of your computer for just this occasion. Use your backup copy to put everything back.
If for some reason you have failed to maintain a backup, not good, then you can redownload some itunes purchases in some countries:
Downloading past purchases from the App Store, iBookstore, and iTunes Store