Step by Step Guide - Delete Adobe Digital Editions Registry Entry
1. Copy and paste the below message to Notepad (select Start and type 'Notepad' to search for program) and save the file as "delete.reg":
Windows Registry Editor Version 5.00
2. Go to the location where you have saved the "delete.reg" file and double click on it.
3. You will see a warning message saying "Are you sure you want to continue?" Click on "Yes" and then select "OK".