http://blogs.technet.com/seanearp/archive/2007/03/25/install-windows-server-2003-adminpak-administration-tools-pack-on-vista.aspxIt's always frustrating when an update to one program from a company breaks compatibility with another program from the same company. In the case of Microsoft, the Windows 2003 SP1 Admin tools (adminpak.msi) do not work on Windows Vista. Windows Serveren-USCommunityServer 2.1 SP1 (Build: 61025.2)