Can't authorize e-books with my new Adobe ID

A week ago I opened my e-books as always. From some time something- I- dont-Know happened and My old ID was unable to open the books. So I've created a new Adobe ID with new pw, erased the former authorization, modified my registry and finally entered the new ID. Now Digital Editions recognize the new ID but the problem stalls : the account is not linked to the book.
Te new ID is totally uneuseful. Can you help me?
Sincerely,
Enrico Dini
Firenze