XP: Rather than searching through EVERY file, I found it a lot easier to just search the Zune files.
Start menu->My Documents->
At the top of that click "Search"
Then on the side -> All files and folders
All or part of the name file: Zune
A Word or phrase in the file: (You can leave blank)
Look in: Local Disk (C:)
It worked better for me because the files I was missing, i searched them and it found them for me.
Hope this helped, those who need it. =]
-Des =]