Problems with Adobe digital edition in new computer

Hi all,

I have a strange problem. I add some previously purchased books to my new computer. It appears in the library but when I close the program down and then open it, the screen in blank. When I try to dd the books, I get a message stating that the books are alrwady there. OK so how do I resolve this problem of books that are there but don't appear at all inthe library t

Thanks

xa