Error authorizing my computer.

When I try to authorize my computer (so I can authorize my Nook) I get this error: "Activation Server error code : E_AUTH_NOT_READY". What should I do?

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, see Access hidden user library files | Mac OS 10.7 Lion. http://forums.adobe.com/thread/1265248?tstart=0

Also, ADE doesn't seem to be recognizing my Nook when I plug it into my computer.

What sort of Nook.

A tablet won't be recognized, you must authorize the ereader app you are using and then copy books using a file manager to the mounted drive.