Connecting the Nook to your PC is unnecessary. Nook for PC syncs with your B&N library on B&N's server. If you have "special" books (not just plain text) some may not be compatible with Nook for PC.
Can you list which 15 books are not transferring over? IT's probably what the earlier poster said - They might be 'Enhanced Editions'.
Hello, thanks for all your replies.
The Nook i have is a Simple touch glow.
Strangely, yesterday my account wasn't showing up over half of my books, but today they are all showing apart from one, which is The Billionaires Daughter.
Not sure why they are all showing now.
The reason i wanted to transfer my book to the PC, is because i'm going to sell my Nook and replace it with a kindle, as i'm unable to get half the books i want here in the UK. Whereas with the Kindle you haven't a problem getting everything you want.