Why has my library deleted everything after installing 7.6 upgrade?

Having transferred all my music - album by album (1500 tunes) to my new computer from my old one, I have just downloaded the 7.6 upgrade and ALL my music library has been deleted from i-Tunes.
I had an earlier deletion last week when I tried to transfer all my music from my i-Pod to my new computer, This resulted in ALL the music on my i-Pod being deleted.
Do I now have to start all over again by manually transferring all my albums back into i-tunes?
Grateful for any advice.
MontanaRose

Try holding down the Shift key in Windows when launching iTunes 7. In the resulting dialogue you will get the option to create a new library or navigate to an existing one. The default location for your iTunes library is in \Documents and Settings\Username\My Documents\My Music\iTunes\. Look in there and see if you have more than one library file (they have the extension .itl) If you have more than one try opening them in turn, you may find your original library is still intact: How to open an alternate iTunes Library file
Have you had a chance to look at this troubleshooting page? It may be of some help: No content shows up in iTunes after updating

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Why has my library deleted everything after installing 7.6 upgrade?

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