If you get any of these error messages when you start Microsoft Outlook:

Error in configuration file “C:\Program Files\Microsoft Office 97\Office\Addins\<filename>.ecf”

The extension configuration file “C:\Program Files\Microsoft Office 97\Office\Addins\<filename>.ecf” could not be installed. There is an error in the syntax or format of the file.

Unable to load <filename>.dll. You may be out of memory, out of system resources, or missing a .dll file

You may have an add-in that is configured incorrectly, a damaged .dll or .ecf file, or a problem with the Extend.dat file, which caches registry extension entries.

To fix these problems, follow the instructions in these MSKB articles:

• OL2000: Error Message in Extension Configuration File (ECF) Starting Outlook
• OL98: ErrMsg in Extension Configuration File Starting Outlook
• OL97: ErrMsg in Extension Configuration File Starting Outlook

Articles that may interest you:

December 14 2010 (KB 2412171) update

Basic Troubleshooting Steps

Say No! to Compatibility Mode

Last reviewed on Sep 12, 2011