Cannot download a library book?

i have a new laptop .  i am authorized on ADE as a user.  I get this error message E-lic_already filled by another user. When I tried to download a library book to my nook the first time, i got an error message on nook-Book is not activated for current ADE user.       Now i get the first error message.  I have the same ADE on both devices.  i have spent 4 hours trying to figure this out.  PLease help!