Verify that Windows Server 2003 Service Pack 2 is installed on the selected computers. If the operating system has been recently ...

Verify that Windows Server 2003 Service Pack 2 is installed on the selected computers. If the operating system has been recently updated, Active Directory updates may still be pending. Wait until the Active Directory updates are complete, and then try to upgrade the protection agent again. The time needed for Active Directory updates depends on your Active Directory domain replication policy. 

For more information about software requirements, see the System Center 2012 DPM System Requirements.