The ADSI (Active Directory ServiceInterfaces) editor is a management console that comes along with the Windows Server support tools. Using this you can edit each and every attribute of the objects present in your active directory database. The support tools for the Windows Server OS is present in the OS installation CD. It is located at [CDDRIVE]:\SUPPORT\TOOLS\SUPTOOLS.MSI
If you don’t have the OS CD you can download it from Microsoft
Download Windows Server 2003 Support Tools
After installation got to Start -> Run and type adsiedit.msc to get the ADSI edit console.
If you get an error message saying adsiedit.msc is not found you have to register the DLL file required for it manually.
To do this go to Start-> Run and type regsvr32 adsiedit.dll.