You cannot use the Get-ADComputer Powershell cmdlets on a Windows 2003 Server; you can instead run it from a member Server running Windows 2008 R2 or above / client machines running Windows 7 or above

There are a series of steps to follow before you can achieve this

• Your Domain Controller running Active Directory on Windows 2003 should be minimum on SP2
• You will need to install Microsoft .NET Framework 3.5 SP1 on your windows 2003 Server
  • http://www.microsoft.com/en-us/download/details.aspx?id=22
• Download and Install the Active Directory Management Gateway Service
  • http://www.microsoft.com/en-us/download/details.aspx?id=2852
• When installing if you locate below error in log file you will need to download and install a hotfix
• Possible Error Message when installing Active Directory Managment Gateway Service (C:\WINDOWS\Assembly\GAC_MSIL\System.DirectoryServices.AccountManagement\3.5.0.0__b77a5c561934e089\System.DirectoryServices.AccountManagement.dll is Less Than 3.5.30729.4126)
• Link to Hotfix for correcting above mentioned error
  • http://support.microsoft.com/kb/969166
• Restart the Windows 2003 Server
• Once the server is restarted; proceed to services and ensure the Active Directory Web Services is started. Change the startup to Automatic

Active Directory Web Service

Remotely Running Get-AdComputer Powershell Commands from Windows 7 Client

• Download and Install Install the Remote Server Administration Tool for Windows 7
  • http://www.microsoft.com/en-us/download/details.aspx?id=7887
• Once Installed; proceed to Control Panel -> Programs and Features -> Turn Windows Features on or off
• Enable the Active Directory Module for Windows Powershell as illustrated below

Active Directory Module for Windows Powershell

• You can now import the Active Directory Module in your Powershell Session within Windows 7 Client

import-module activedirectory

Remotely Running Get-AdComputer Powershell Commands from Windows 2008 R2 Member Server

• Open Server Manager – Features – Add Features
• Ensure that the Active Directory module for Windows Powershell is enabled as illustrated below

Active Directory Module for Windows Powershell in Windows 2008 R2 Server

• You can now import the Active Directory Module in your Powershell Session within Windows 2008 R2 Member Server

import-module activedirectory