If your company decides to sign their Enterprise Library files with their public and private keys the default Ent LIb Configuration tool that is integrated with Visual Studio will not by default use the newly signed assemblies.  The following is a brief description on how to update your system so that the appropriate assemblies are used. 1.) Add the following registry key and values to the registry HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\VisualStudio\9.0\Packages\{488366a4-630c-4a0e-a6a2-b019cee13bea}\{ConfigurationSets} You need to add an additional configuration set.  By default you will see the Microsoft Signed set.  Below is how the new key will...

The default installation folder C:\Program Files\Microsoft Enterprise Library 4.1 - October 2008 Bin - contains the binaries you can use in the application.  Also the configuration editor EntLibConfig.exe which can be used to create and edit configuration files for EntLib Docs - documentation Src - contains the installer file for the Enterprise Library source file Visual Studio Integration - contains binaries that make the configuration Editor available in Visual Studio The installer also puts the original source code in C:\EntLib41Src ...