I get this message when I try to log on to itunes "The file "itunes Library.itl" cannot be read because it was created by a newer version. The only thing I did different was to upload the newer version as was suggested!!!!
Thanks the the question, that definitely sounds frustrating. I advised that we follow the directions outlined in the following article:
iTunes for Windows: Doesn't open after upgrading in Windows Vista or Windows 7
If that does not resolve your issues, please refer to:
iTunes: How to re-create your iTunes library and playlists
Retrieving data ...