Windows Server 2003 R2 DNS and Active Server is Crashing

Hello,

Recently Windows Server 2003 has been crashing 1X/day. In the Event Viewers log, it gives me the following error message in the DNS Event Viewer: ID 4015 , 4004 and 4000. (See below)Then no one has access to the server because active directory and the dns server aren't functioning. However, when I reboot, the system works fine for about a day, then it crashes again. I HAVE BEEN GOING CRAZY TRYING TO FIND A SOLUTION. I am trying to learn this networking on the fly. Can someone please help ASAP? Thanks


Event Type:      Error
Event Source:      DNS
Event Category:      None
Event ID:      4015
Date:            11/28/2008
Time:            11:37:57 AM
User:            N/A
Computer:      SERVER1
Description:
The DNS server has encountered a critical error from the Active Directory. Check that the Active Directory is functioning properly. The extended error debug information (which may be empty) is "". The event data contains the error.

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
Data:
0000: 51 00 00 00               Q...    

Event Type:      Error
Event Source:      DNS
Event Category:      None
Event ID:      4004
Date:            11/27/2008
Time:            2:26:59 PM
User:            N/A
Computer:      SERVER1
Description:
The DNS server was unable to complete directory service enumeration of zone ..  This DNS server is configured to use information obtained from Active Directory for this zone and is unable to load the zone without it.  Check that the Active Directory is functioning properly and repeat enumeration of the zone. The extended error debug information (which may be empty) is "". The event data contains the error.

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
Data:
0000: 2a 23 00 00               *#..    

Event Type:      Error
Event Source:      DNS
Event Category:      None
Event ID:      4000
Date:            11/27/2008
Time:            2:29:59 PM
User:            N/A
Computer:      SERVER1
Description:
The DNS server was unable to open Active Directory.  This DNS server is configured to obtain and use information from the directory for this zone and is unable to load the zone without it.  Check that the Active Directory is functioning properly and reload the zone. The event data is the error code.

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
Data:
0000: 2a 23 00 00               *#..