Group policy processing aborted

Hello sir,
I am working in windows server 2003 system.I face this
following error in the event viewer.This system is the domain controller.

In the Application event viewer,
--------------------------------
Product: Windows Operating System
Event ID: 1030
Source: Userenv
Version: 5.2
Symbolic Name: EVENT_GPO_QUERY_FAILED
Message: Windows cannot query for the list of Group Policy objects. Check
the event log for possible messages previously logged by the policy engine
that describes the reason for this.


In the system event viewer:
----------------------------
Product: Windows Operating System
Event ID: 5781
Source: NETLOGON
Version: 5.2
Symbolic Name: NELOG_NetlogonDynamicDnsServerFailure
Message: Dynamic registration or deletion of one or more DNS records
associated with DNS domain '%1' failed. These records are used by other
computers to locate this server as a domain controller (if the specified
domain is an Active Directory domain) or as an LDAP server (if the specified
domain is an application partition).

Possible causes of failure include:
- TCP/IP properties of the network connections of this computer contain
wrong IP address(es) of the preferred and alternate DNS servers
- Specified preferred and alternate DNS servers are not running
- DNS server(s) primary for the records to be registered is not running
- Preferred or alternate DNS servers are configured with wrong root hints
- Parent DNS zone contains incorrect delegation to the child zone
authoritative for the DNS records that failed registration

USER ACTION
Fix possible misconfiguration(s) specified above and initiate registration
or deletion of the DNS records by running 'nltest.exe /dsregdns' from the
command prompt or by restarting Net Logon service. Nltest.exe is available in
the Microsoft Windows Server Resource Kit CD.


In the another system in this network, I got this following error message :
-------------------------------------------------------------------------
Product: Windows Operating System
Event ID: 1053
Source: Userenv
Version: 5.2
Symbolic Name: NT AUTHORITY\SYSTEM
Message: Windows cannot determine the user or computer name.[The specified
domain either does not exist or could not be contacted].Group Policy
processing aborted.


What is the wrong in this system?
Any help would be really appreciated.

with regards,
Senthil Raj