thank you for your answers, but I posted on questions to lva and Anthony's answer to me was:
There may be some sort of App that lets you transfer a PDF (which is what you get with the version of e-books we sell) so you can see it on the Nook, but you can't convert it into the Nook e-platform. Our e-books are mostly for people who don't have a reader of some type. If you have one, you should buy from that store for full functionality and probably best price.
So, bottom line is, you can't transfer it to a nook.
And Big Dawg: I agree w/you, B & N has always been helpful. I've had my nook almost 2 years and I download all the time from the library. That was the reason I got the nook. At the time Kindle would not let you download from the library but I guess they had to change because too many people were going with the nook.
Dandiego - that's how I transfer books from the library is by connecting it to my computer via the USB port.
Thanks again for both your input.