I had to re-install my OS which wiped out everything. When I was installing fre adobe digitial edit

Question

I had to re-install my OS which wiped out everything. When I was installing fre  adobe digitial editions I accidentally activate it without ID. I cannot copy my library e-book from my computer to my ereader.
So I am trying to activate adobe with and ID but is unsuccessful because it thinks that I already have it.  A Chat with adobe had me de-authorized and now I cannot authorize and cannot read my e-book.

Answer 1

Deauthorizing and reauthorizing Adobe Digital Editions 2.0 on your computer and your reader
These instructions are for the 2.0 edition of Adobe Digital Editions.
Please note that if you deauthorize your computer and/or reader, you will lose access to any content with Digital Rights Management  that was downloaded using that authorization.
Create an Adobe ID
Create an Adobe ID here. You may want to write down the email address and password you use.
If you are authorizing your Nook, use the same email address you used to register your Nook.
Deauthorize your reader
1. Plug your reader into your computer with the USB cable.
2. Open Adobe Digital Editions.
3. Click on the name of your reader, displayed under Devices in the menu on the left of the screen.
4. Click on the gear icon, then on Erase Device Authorization.
5. Confirm that you want to deauthorize your device by clicking on Erase Authorization.
6. Safely eject your reader from the computer.
Deauthorize your computer
1. Open Adobe Digital Editions.
2. Press <CTRL>+<SHIFT>+<D>
3. A window will appear asking if you want to deauthorize your computer. Confirm that you want to deauthorize your device by clicking on Erase Authorization.
4. Close Adobe Digital Editions.
Reauthorize your computer
1. Open Adobe Digital Editions.
2. Click on Help, then on Authorize Computer.
3. Enter the email address you used to create an Adobe ID and your password, then click on Authorize.
Reauthorize your reader
1. Plug your device into your computer using the USB cable.
2. You should see the device name appear under Devices on the left side of the screen. Click on the name of your device.
3. Then click on the gear icon, and on Authorize Device.
4. You should see the Adobe ID you authorized your computer with listed as the default ID. Click on the Authorize Device button.
5. Safely eject your device from the computer.