I can't authorise my computer. Problem since changing my hard drive?

[markb86415700]

February 2015 my hard drive and mother board failed. Apple replaced the mother board and I paid for a new solid state hard drive.

Since then, my Digital Reader has not functioned.

I now urgently need to download an ebook for work purposes and I'm not able to do so.

Same problem a year ago but I never pursued the problem to a conclusion. Now I must.

WHY CAN'T I AUTHORISE MY COMPUTER WITH A NEW HARD DRIVE?

This is Adobe's solution to solving problems? A forum? Unbelievable.

I can no longer read my ebooks. When trying to authorise my computer I continually get this message:

An Error Has Been Detected

Activation Server error - code E_AUTH_NOT_READY

Digital Editions encounter an error on the activation server.

I've purchased a new ebook today and it won't open.

I get the same message as above when I try to authorise my computer?

[Nanaky]

Windows:

    Close all applications.

    Choose Start > Run.

    In the Open text box, type regedit and then press Enter. The Registry Editor opens.

    In the left pane of the Registry Editor, locate the following registry key: HKEY_CURRENT_USER\Software\Adobe\Adept

    Select the Adept key.

    Choose File > Export.

    In the Export Registry File dialog box, select Selected Branch under Export Range. Enter a name and location for the backup registry key, and then click Save.

    Right-click the Adept key and choose Delete.

    In the Confirm Key Delete dialog, click OK.

    Close the Registry Editor.

    Open Adobe Digital Editions and reauthorize.

Macintosh:

    quit Adobe Digital Editions.

    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 https://helpx.adobe.com/x-productkb/global/access-hidden-user-library-files.html

    Open Adobe Digital Editions and reauthorize.