SW upgrade wiped out my iTunes library and also now iTunes will not launch

I just completed the recommended Sw upgrade for iTunes and now iTunes will not launch and my iTunes library is TOTALLY EMPTY.
Clearly, I am NOT A HAPPY CAMPER. I have lost a substantial investment of $$ and time in losing my iTunes library - so Apple should be paying me for my loss.
I need help, can you, will you help me? I want my iTunes library back and I'd like to reinstall the previous version of iTunes, because it worked fine.
Barbara Bowen
Apple, 1983-1993

You don't say which versions so we don't know to which version you wish to revert. Reverting won't get back your library anyway, if it is truly gone.
Have you checked if your library is truly gone? Have you looked in the iTunes folder and the media folder inside of it? The library has two main components, all the media files for the individual tracks and the iTunes Library.itl file which give them the structure you see in iTunes. Sometimes iTunes just loses track of the library file which can be re-linked, and what's really important anyway are the media files.
If the library is truly gone you can restore it from the backups you make of your computer. Backups are a responsibility of any computer owner ever since computers were invented. If you don't have backups then it may be possible to redownload items purchased from the iTunes Store.
I know I have glossed over some of this but it's not worth going into details on how to do all the different things until we know precisely what it is that needs doing.

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Message was edited by: Ingo2711

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http://discussions.apple.com/message.jspa?messageID=3904310#3904310
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SW upgrade wiped out my iTunes library and also now iTunes will not launch

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