ITunes deleted my whole music library. I was not performing an upgrade at the time. They disappeared over night without me doing anything. How can i get them back without going one by one?

I woke up this morning to find my computer had restarted itself. I don't know why. Must've upgraded something. When i opened iTunes my entire library was gone. The playlists are still there, just nothing inside them. iTunes didn't upgrade over night since it still asks me to. I've tried a system restore to the day previous but it did nothing. How can i get everything back the way it was? I would really like to not have to import it all again individually.

Empty/corrupt library after upgrade/crash
Hopefully it's not been too long since you last upgraded iTunes, in fact if you get an empty/incomplete library immediately after upgrading then with the following steps you shouldn't lose a thing or need to do any further housekeeping.  Note that in iTunes 11 an "empty" library may show your past purchases with links to stream or download them.
In the Previous iTunes Libraries folder should be a number of dated iTunes Library files. Take the most recent of these and copy it into the iTunes folder. Rename iTunes Library.itl as iTunes Library (Corrupt).itl and then rename the restored file as iTunes Library.itl. Start iTunes. Should all be good, bar any recent additions to or deletions from your library.
See iTunes Folder Watch for a tool to catch up with any changes since the backup file was created.
When you get it all working make a backup!
Should you be in the unfortunate position where you are no longer able to access your original library, or a backup of it, then see Recover your iTunes library from your iPod or iOS device.
Would you mind telling me which anti-virus package you use? It may be that it is disturbing iTunes when it tries to write out the fresh database, as it does after almost any activity with your library. I'm noticing more of this type of problem than usual and trying to see if there is any pattern. It may help to prevent a repeat of the problem if you look at the advanced options for your AV package and see if you can find a way to exclude the iTunes folder from any real-time scanning process.
tt2

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