Try this: (with caution)
Close iTunes
In your xp c:\docs and settings\name\my music\itunes
vista c:\users\NAME\music\iTunes
Move the xml and itl file to your desktop.
Open iTunes (it will be empty) and go to the File Menu > Add folder.
Choose the video folder on your desktop. See if it adds.
Do the same for your iTunes folder to add the music.
That should repopulate your library within iTunes.
Just so you know; it may have to re download album artwork so depending on how well your files are tagged or if you added artwork manually, this may not work very well.
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