Adobe Digital Editions - Erase Computer Authorization

[Guest]

I am trying to Erase Computer Authorization and it says "Unable to Erase Authorization. Please try after some time." It didn't work yesterday and it won't work today.

The reason that I am doing this is because when I try to download a book to study for an upcoming exam, it says "Error! Check Activation."

[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.

[Guest]

I have windows 10 and those instructions do not help me to deauthorize. 

Are there other instructions I can follow?

[Nanaky]

The steps should work also. Which step do are not found under Windows 10?

[gordonm18444432]

There is no start/run in windows 10. How do I find that?

[Nanaky]

Press WINDOWS + R and enter under this regedit and press enter.