Active Directory Services Interfaces (ADSI) 2.5

·Windows 2000: there is no need to install ADSI on Windows 2000 machines since the operating system supports ADSI by default.  
·NT4: ADSI 2.5 must be installed in order to use ADSI commands.  

How to Install ADSI

·Go to http://www.microsoft.com/ Enter "ADSI" in the "Search" text box Click "Download ADSI 2.5" (Size: 476k) Install it (takes one minute).