Fixing the Dragon “Hook Error”

Adobe® Acrobat Reader X has been causing Dragon® Medical 10.1 and 11 to display the following error message:

“COM returned an unexpected error code: Details are HOOKERR_NONOTIFYWINDOW”

This message is caused by a conflict with Acrobat Reader X.  To fix this issue. you have two options:

1. Uninstall Adobe Acrobat Reader X

2. Disable Protected Mode

If you must use Adobe Acrobat Reader X, then follow the steps below to disable Protected Mode:

  • Start Adobe Acrobat Reader X
  • Go to Edit > Preferences > General Tab
  • Uncheck “Enable Protected Mode at startup”

This should fix the issue and prevent the error message from appearing again.

Verification Source: In-house testing