When installing Spira on SQL Server 2012 (any edition) using Windows Authentication, you may receive an error message "Cannot Create User" (or similar) during the installation. This is because of a configuration change in SQL Server 2012 (as opposed to earlier versions). This article explains the step needed to prepare SQL Server 2012 for installing Spira v3.x. Newer versions of Spira will not need this step as the installer has been updated.