Error: “Acrobat Failed to Load core DLL”

Issue

When you launch Adobe Acrobat or Adobe Reader, you receive the error “Acrobat Failed to Load core DLL.”

Solutions

Solution 1

Use one of the following options to repair the installation to replace any possible missing or corrupt files:

  • The Help menu in Adobe Acrobat or Adobe Reader.
  • The Add/Remove Control Panel in Windows.

Solution 2

Launch Adobe Reader/ Adobe Acrobat, and click on "Edit"-> "Preferences".

Adobe Acrobat X/Adobe Acrobat XI

Click on Security (Enhanced), and Protected View options.

Adobe Reader XI

Click on Security (Enhanced), and uncheck the "Enable Protected Mode at startup" check box.

Adobe Reader X

Click on General, and uncheck the "Enable Protected Mode at startup" check box.

Solution 3

If you are using a tool to push a registry entry for multiple users, you can disable Protected Mode in the Registry:

HKCU/Software/Adobe/Acrobat Reader/[VERSION_NUMBER]/Privileged/bProtectedMode = 0x00000000

Solution 4

Make sure that Adobe Acrobat or Adobe Reader are installed to the local system drive. Installing on a mapped drive is not a supported configuration.

Solution 5

Uninstall and Reinstall Adobe Acrobat or Adobe Reader.

Note: If you have difficulty removing Adobe Acrobat or Adobe Reader versions 9.x or 10.x, use the Adobe Reader and Acrobat Cleaner Tool from Adobe Labs.

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