Tried deleting "CS info" ?
You can also try to delete the "CS info" directory in Itunes, I was lucky with that one.
Another suggestion I read elsewhere for this error is to update Itunes to the latest version.
.... For me Itunes is a very annoying user experience (low volume, issues playing om my HD monitor, to various bugs from time to time), I think they'll only fix these things when a big competitor comes along and makes it easy to rent many popular movies.