Windows Server 2008 Group Policy did not affect on Client Machine (Windows XP Pro)

Identify the problem

1. Check Event Viewer
   Start Menu, Control Panel, Performance and Maintenance, Administrative Tools, Event Viewer.
2. Under Event Viewer Tree, click on Application
3. Double click on the Error to see the details.
4. If the problem description same as the one in below picture. The possibility is that you have a DNS problem. To read more about other possibilities, you can click on the provided link.