I downloaded an ebook from borders.com to my home computer. It did not work. I downloaded it to my work computer and it did work. In the process I figured out what went wrong at home and fixed it. When I tried to download and use my book at home, it would not work. At work the next day I got the same error message saying I could not use my book. I would like to be able to use it on either computer, but more importantly, I would like to be able to sync it to my Nook. How do I do this?