I have an new Nook Touch, so this answer is not about the Nook Color. Excuse the very simple step by step explanation, but I want people to actually understand.
This was a borrowed Epub Library books, which may be the most difficult. But that's why I bought the Nook, to read free library books (Sorry, B&N, but I'm not working, like many people and can't really affort to buy or store everything I want to read...The Nook was a gift from my sister).
ADE refers to Adobe Digital Edition,
1. First you have to borrow the book electronically from the library and download it to your laptop. Mine wound up in C:\users\my documents\my digital editions. (And NOT in any of the subfolders of my digital editions).
2. Plug your Nook into your laptop using the Nook cable, and authorize it, if you already haven't. This takes a little time and effort so review the ADE Forum on that topic. You have to have the Nook plugged into the laptop to do this, and leave it plugged in til I tell you to unplug.
3. On my laptop, opened ADE, and the Nook was recognized (shows on the left column). If it doesn't show, go back to Authorize.
4. On my laptop, in ADE, drag (not copy) the library book icon from ADE to the Nook icon in ADE on the left (not any of the Nook subfiles, just NOOK on ADE. Click on Nook in ADE list on the left, and see if the book really made it.
5. Opened Windows Explorer in a separate window, opened My Computer, opened Nook, opened "digital editions" (has a icon that looks like an open book) to see that book really arrived. This confirms that the Nook and the laptop agree.
6. Close Windows Explorer and unplug the Nook. Now we are done with the laptop.
7. Open your Nook. It will have gone to sleep when it's plugged into the laptop, which is ok.
8. Open the Nook Library. If the selection window at the top left is set to "Books" you will NOT see your new book, even though ADE and Windows Explorer say it's there. Stop screaming.
9. This is where the magic happens: Change the selection menu at the top left of the Library screen to " All ". And voila! your new book appears! Open the new book, congratulate yourself on an outstanding technical feat and enjoy your new book!
Again, sorry for the baby-talk solution, but I wanted to be clear. If anyone finds errors, please let me know.
Only one point to add.
Before you unplug the Nook, disconnect it logically from your computer.
Since you're in Windows Explorer, right click on the Nook in the left side
of the Explorer display (where it gives the Nook a drive letter), and choose
When the window refreshes, the Nook should be gone from the list. THEN
Everything is just great until I get to your step number 9. I got a color nook but I can't find the so-called "selection menu in the upper left corner where I'm supposed to select 'all'". I've poked at everything there is in that upper left corner but nothing like a selection menu pops up.
I've got the word "Library" at the very top. Then I have options like " Books" , Magazines, Newspapers etc. across the top. There's no option to select all.
I was working with a Nook Touch, so it may be different. The idea was that
ebooks apparently show up differently than just 'books'. Maybe you have a
different menu that has choices for more than books and mags? Maybe there's a
different storage are that keeps things other than books, that isn't the
'library'. Might be there, you may have to dig around.