My iTunes library is missing since upgrade Lion 7.2.  I have it all backed up so that's not the issue. How can I reinstall it with all my hundreds of playlists intact or do I have to recreate each one upon reinstalling the backup copy? Thank you for help

Almost my iTunes library is missing since upgrade Lion 7.2. (the last 2.5 weeks worth of added music has transferred post-upgrade, none of whcih was bought from iTunes)
I have it all backed up so that's not the issue. How can I reinstall it with all my hundreds of playlists intact or do I have to recreate each playlist upon reinstalling the backup copy? This would save a HUGE amount of time and efforts. Thank you for your help!

hi Limnos,
I do not mean the entire ITunes folder but, rather, the contents of the ITunes folder prior to September 29th.  (90% of the media is missing, along with all playlists)  The media that remains says it was added on 9/29 although I know most of it was added many months or even years earlier. There are no playlists listed at all, before or after 9/29.  (I know for certain that I added non-iTunes purchased songs on 10/6 although I had not created playlists for them)
I have my iTunes folder backed up on both an external drive as well as Time Machine.
I run iTunes off of an ITunes folder on my computer rather than from the external, if that's what you mean about how I have it set up. 
Is it OK to drag the entire iTunes folder from the external drive onto my laptop's drive and see if that fixes it?
Thank you for your help!
Deb

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