That's an easy question to ask - but it might require a more complicated
answer, depending on a number of factors. I don't want to be condescending,
so if you're well beyond the stuff below, pick and choose what you need.
First, let me assume that you have been using your Kindle for a while and
are comfortable with the way you transfer ebooks from B&N to it.
Next, let me assume that you've downloaded Adobe Digital Editions (ADE) and
registered it with Adobe.
Finally, let me assume that you've downloaded an ebook to ADE successfully.
The missing piece is whether you've ever connected your Kindle to ADE via
your computer's USB interface. So, let me star there.
I'll assume you're using a Windows computer.
Connect the Kindle to your computer via a USB cable. Then, turn the Kindle
on. The computer should indicate that an external hard drive has been
connected. The Kindle will show that it's connected to the computer.
Now, open ADE. It should open in Library view, with two panes. The left
hand pane is the bookshelf pane, and if the Kindle has been registered with
B&N, but never connected to ADE before, ADE might ask you to authorize the
device. Not a big deal. Once that's been done, your Kindle should appear
on the bookshelf pane. At that point, all you have to do is drag the ebook
from the right hand pane to the Kindle on the left, and ADE does the rest.
When you're done, exit ADE first, then watch the Kindle to make sure it
finishes updating before you disconnect it from the computer.
Hope that helps!
Actually... the above mentioned method would work for a Nook from B&N, not a Kindle from Amazon. Currently you cannot legally
use DRM protected PDF's on the Kindle. To use non-DRM protected book just connect your Kindle via USB to your computer and put them on there. But until Amazon decides they need to support the DRM PDF's Kindle users are out of luck. Or you could do like I do and view the handful of DRM protected PDF books I have for Adobe Digital Editions with the Adilko reader on my smartphone.
That's not entirely true either. Amazon has linked its Kindle to its
website by using a 'superset' of .epub files. Also, ADE does not support
this formatting, and thus Kindles can't connect to ADE directly. I am not
sure whether the non-Kindle .epub files could be copied onto a Kindle and
then be accessible because of the way Amazon writes the files.....
How can I solve this problem?
Assuming you are interested still in the original question:
I ordered and received adobe digital editions and due to hardware problems I´ve lost the files.
You can't generally recover Adobe DRM files; once you have downloaded them it is your responsibility to keep safe backups.
Some vendors are able to reprovision lost books; unfortunately most can't (any more than real booksellers will just replace burnt books).
As they said, Amazon have moved all their books to their proprietry format.
They sell the Kindle cheap so that they can lock you in to buying their books.
Even if you still had the Adobe digital editions files, you could not convert them to Kindle format (short of DRM stripping).