If you try to install Windows Defender by downloading a separate file as you would on XP, you will receive an error preventing you from installing.
Windows Server 2008 no need to download a separate file in order to install Windows Defender. To install Windows Defender on Server 2008 you first need to install the Desktop Experience which includes Windows Defender. Desktop Experience is available as a Feature from the Server Manager.
Following steps will show how to
Open the Server Manager, from the Features Summary click on Add Features.
From the Add Features Wizard select Desktop Experience and click one Next.
After Installing Desktop Experience feature we need to restart the Server
As the server will get restarted we will able to see following screen and Windows defender is operational