Adobe Digitial Editions

Hello, I purchased a book from Booksamillion.com yesterday. I was told I needed to download the Adobe Digital Editions software. I downloaded the software and added my book to the library. However, I keep receiving the following error message: The vendor account you entered is not associated with the item you are trying to open. Hello, I purchased a book from Booksamillion.com yesterday. I was told I needed to download the Adobe Digital Editions software. I downloaded the software and added my book to the library. However, I keep receiving the following error message: The vendor account you entered is not associated with the item you are trying to open.