Unable to register the DLL/OCX error



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How to fix "Unable to register the DLL/OCX error"

This error may occur, in very rare cases, when you are trying to install the latest version of the add-in over your current, registered version. You may get one of the following errors:

  • Windows Vista: "Microsoft Register Server has stopped working" error.
  • Windows XP: Unable to register the DLL/OCX: RegSvr32 failed with exit code 0xC0000005 (or 0xC0000007).

Please do not worry, these errors are easily fixed. All you need to do is to delete the activation key from the registry. To remove the key, please download, unzip and execute the reg file (see table below). After that install the add-in again and activate it.

If you are an IT person or a system administrator, please see the instructions below.

Reset keys for Add-ins for Microsoft Excel

Reset keys for Plugins for Microsoft Outlook

For IT persons and system administrators:

The registration keys are stored in the HKEY_CURRENT_USER\Software\Add-in Express registry branch. For example, HKEY_CURRENT_USER\Software\Add-in Express\Auto BCC for Outlook\Key

To fix the "register the DLL/OCX: RegSvr32 failed" error, you just delete an add-in activation key from the registry. Then install the add-in again and activate it.


 

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