I needed to format my computer but now, with Adobe Digital Edition, I cannot authorize it with my previous e-mail account data. when I try to authorize my computer formatted with my previous ID Adobe (e-mail adress), it is not accepted because they say that with this ID Adobe they have autorized another computer but it is not true! The computer is the same one, only, it is formatted !!
You quite right, it isn't true. Alas, ADE is just a crummy program.
Sometimes ADE gets its registration/activation confused and in a semi-authorized state.
Uninstalling and reinstalling does not help, and indeed installation can even trigger this state.
Unfortunately, it often then gives misleading error messages about what is wrong.
A common incorrect message informs you that the ID is already in use on another computer and cannot be reused.
Another is "E_AUTH_NOT_READY"
This can often be resolved by completely removing any authorization using ctrl-shift-D to the Library screen on ADE (cmd-shift-D if on Mac).
Restart ADE, and then reauthorize with your (old) Adobe ID.
In extreme cases on the mac, the following extra step has helped some people. Navigate to /Users//Library/Application Support/Adobe/Digital Editions and drag the activation.dat file to the trash. If you are using 10.7,