1. When you start Windows Server 2008 for the first time or the Do not show this window at logon check is disabled you will see the following screen at startup. Otherwise you have to open the Initial Configuration Tools by clicking Start, and typing oobe. After the start menu has a result press Enter.
In the Initial Configuration Tools window click Provide computer name and domain. In the System Properties window that shows up click Change. Fill in the Computer name and Workgroup and click OK twice. After you click the Close button in the System Properties window choose to restart the computer.