MS KB Q930056: Error message "MMC could not create the snap-in" --http://support.microsoft.com/default.aspx/kb/930056
Error message when you install the Windows Server 2003 management tools on a Windows Vista-based computer: "MMC could not create the snap-in"
Describes some of the limitations that exist when you run the Service Pack 1 version (build 5.2.3790.1830) of the Adminpak.msi file on a Windows Vista-based computer. Provides steps to install the Windows Server 2003 management tools.