I know what you are talking about. On my old laptop and one of the desktops, only one of the users was the administrator. It caused a few problems with non-sharing of certain programs and files. I use to transfer stuff by copying to a flash drive and dropping on to the other side.. This was a quick, easy, and understandable way for me to do it.
Just a thought, but maybe you are not the listed admin on that computer and the Reader Library was originally downloaded on the admin side.
On this laptop, I just made sure not to have separate users logging on, they can use my old laptop
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I'm glad you are able to read your books now.