This problem may occur when the program configuration file is damaged. To fix the problem, please do the following steps:

1. Uninstall AOPR using Windows Control Panel.

2. Manually delete the program directory if it was not deleted automatically.

3. Locate all instances of the "aopr.ini" file. Usually this file is located in c:\Windows, you can use Windows Search to locate it. If any files are found - delete them.

4. Manually delete AOPR settings in system Registry. Execute the following command from the elevated ("Run as Administrator") command line:

reg delete "HKCU\Software\Elcomsoft\Advanced Office Password Recovery"

5. Download the latest version of AOPR and install it.