@mobi007.
I reverted without using "Time Machine," following some of the instructions given earlier in this discussion.
One of which mentions removing the Library for 11 and that did the trick, other wise you get "error," messages.
It worked fine, but I'm using Windows Vista..
I did lose my playlists and artwork etc.
I've never really "rated," my songs.
However, I don't have that many playlists, only about 5, or 6 which I replenished from ideas thrown up by DJ which is why I love the function so much, it constantly suggests new songs, or songs I wouldn't think of looking for in a pretty vast selection..
I also lost the Album Artwork, so, in a way it's like starting from scratch and that had to be re-loaded..
But, for me, it was worth it.