Can't add books to library

Whenever I try to add ebook (either bought (i.e. link) or from my computer) into ADE i get the error message that "ADE 4.0 has stopped working". I have tried it several times, restarted the Computer, and reinstalled the program, but it still does not work. I use Windows 7 Home Premium and downloaded Windows edition (twice actually- once via Firefox, second time- via Chrome). Can anyone help me?