itunes on macosx- itunes library EMPTY!!!

[wonderwillow]

I installed LW 2 days ago. Since each time I shut my macbook down when I restart Itunes gives a message that says "the iTunes library has been found to be invalid a new library is being opened named iTunes Library (damaged)"
there are no files in this library whatsoever, whether from my CDs, purchased from iTunes, or from LW. I can go to "Add to Library" and all of the files are still there, and they will import back into my iTunes library (of course needing names fixed again, etc) but they will not be there the next time I restart my computer.

does anyone know what's going on?

Thanks!
Wonderwillow