Hey Sheri, I am a computer tech and if I am reading what your are trying to do properly, you should be able to re-download the books because you already purchased the. First off, B&N is run by a Nook App on both Samsung w/ Android & Samsung w/ Windows8. So as long as B&N allows you to re-download or you can transfer the books, then download the Nook App... You should be fine. For the future you may want to switch to Amazon's Kindle just because they are much easier to deal directly with. I hoped this helps... And good luck to you!
it all depends where you purchased your books and what app you use to read your books. if you are purchasing a Samsung with android operating system or windows 8 operating system and you purchase(d) your books from amazon, then you just need to download the app.