Fix: There Was an Error Opening this Document. Access denied. - Adobe Acrobat

If you receive the following error in Adobe Acrobat Reader, perform the following steps.

There was an error opening this document. Access denied.

1. From Adobe Reader, select Edit -> Preferences.

2. Select Security (Enhanced) on the left pane.

3. Uncheck the Enable Protected Mode at startup box.

4. Select Yes to the prompt about being sure about making this change.