Windows 2003 DHCP-DNS PROBLEMS-UNABLE TO JOIN THE DOMAIN OR PING

We are small Biotech company in the process of implementing Active Directory and Exchange.
Windows 2003 server is up and running but I'm having DHCP and DNS problems.  We have an internet Registered Domain and ready to add MS Exchange soon.
I've tried using MS step by step troubleshooting tools but none seems to help.   For one, I can't join any of my workstations to the Domain, dhcp is not issuing ip addresses, cannot ping the dc name or ip  and there could be some issues with DNS.
I've gathered enough info from DCDIAG and NETDIAG tests all ran from the DC.   I'm gonna need to create MX Records for Exchange..so if you can include that too..I'll appreciate........ Here are the results:

Microsoft Windows [Version 5.2.3790]
(C) Copyright 1985-2003 Microsoft Corp.

C:\Documents and Settings\Administrator.MEDSRV1.000>cd\

C:\>ipconfig /all

Windows IP Configuration

   Host Name . . . . . . . . . . . . : medsrv1
   Primary Dns Suffix  . . . . . . . : XYZ.com
   Node Type . . . . . . . . . . . . : Unknown
   IP Routing Enabled. . . . . . . . : No
   WINS Proxy Enabled. . . . . . . . : No
   DNS Suffix Search List. . . . . . : XYZ.com

Ethernet adapter Local Area Connection 2:

   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Intel(R) PRO/100+ PCI Adapter
   Physical Address. . . . . . . . . : 00-90-27-71-A2-BC
   DHCP Enabled. . . . . . . . . . . : No
   IP Address. . . . . . . . . . . . : 192.168.1.5
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Default Gateway . . . . . . . . . : 192.168.1.1
   DNS Servers . . . . . . . . . . . : 192.168.1.5

C:\>dcdiag.exe

Domain Controller Diagnosis

Performing initial setup:
   Done gathering initial info.

Doing initial required tests

   Testing server: Default-First-Site-Name\MEDSRV1
      Starting test: Connectivity
         ......................... MEDSRV1 passed test Connectivity

Doing primary tests

   Testing server: Default-First-Site-Name\MEDSRV1
      Starting test: Replications
         ......................... MEDSRV1 passed test Replications
      Starting test: NCSecDesc
         ......................... MEDSRV1 passed test NCSecDesc
      Starting test: NetLogons
         ......................... MEDSRV1 passed test NetLogons
      Starting test: Advertising
         ......................... MEDSRV1 passed test Advertising
      Starting test: KnowsOfRoleHolders
         ......................... MEDSRV1 passed test KnowsOfRoleHolders
      Starting test: RidManager
         ......................... MEDSRV1 passed test RidManager
      Starting test: MachineAccount
         ......................... MEDSRV1 passed test MachineAccount
      Starting test: Services
         ......................... MEDSRV1 passed test Services
      Starting test: ObjectsReplicated
         ......................... MEDSRV1 passed test ObjectsReplicated
      Starting test: frssysvol
         ......................... MEDSRV1 passed test frssysvol
      Starting test: frsevent
         ......................... MEDSRV1 passed test frsevent
      Starting test: kccevent
         ......................... MEDSRV1 passed test kccevent
      Starting test: systemlog
         An Error Event occured.  EventID: 0x00000423
            Time Generated: 07/22/2007   06:38:20
            Event String: The DHCP service failed to see a directory server
         An Error Event occured.  EventID: 0x00000416
            Time Generated: 07/22/2007   06:38:20
            Event String: The DHCP/BINL service on the local machine,
         An Error Event occured.  EventID: 0x00000423
            Time Generated: 07/22/2007   06:38:20
            Event String: The DHCP service failed to see a directory server
         ......................... MEDSRV1 failed test systemlog
      Starting test: VerifyReferences
         ......................... MEDSRV1 passed test VerifyReferences

   Running partition tests on : ForestDnsZones
      Starting test: CrossRefValidation
         ......................... ForestDnsZones passed test CrossRefValidation

      Starting test: CheckSDRefDom
         ......................... ForestDnsZones passed test CheckSDRefDom

   Running partition tests on : DomainDnsZones
      Starting test: CrossRefValidation
         ......................... DomainDnsZones passed test CrossRefValidation

      Starting test: CheckSDRefDom
         ......................... DomainDnsZones passed test CheckSDRefDom

   Running partition tests on : Schema
      Starting test: CrossRefValidation
         ......................... Schema passed test CrossRefValidation
      Starting test: CheckSDRefDom
         ......................... Schema passed test CheckSDRefDom

   Running partition tests on : Configuration
      Starting test: CrossRefValidation
         ......................... Configuration passed test CrossRefValidation
      Starting test: CheckSDRefDom
         ......................... Configuration passed test CheckSDRefDom

   Running partition tests on : XYZ
      Starting test: CrossRefValidation
         ......................... XYZ passed test CrossRefValidation
      Starting test: CheckSDRefDom
         ......................... XYZ passed test CheckSDRefDom

   Running enterprise tests on : XYZ.com
      Starting test: Intersite
         ......................... XYZ.com passed test Intersite
      Starting test: FsmoCheck
         ......................... XYZ.com passed test FsmoCheck

C:\>Netdiag.exe

....................................

    Computer Name: MEDSRV1
    DNS Host Name: medsrv1.XYZ.com
    System info : Windows 2000 Server (Build 3790)
    Processor : x86 Family 6 Model 7 Stepping 3, GenuineIntel
    List of installed hotfixes :
        KB924667-v2
        KB925398_WMP64
        KB925902
        KB926122
        KB927891
        KB929123
        KB930178
        KB931784
        KB931836
        KB932168
        KB933566
        KB933854
        KB935839
        KB935840
        KB935966
        KB936357
        Q147222


Netcard queries test . . . . . . . : Passed



Per interface results:

    Adapter : Local Area Connection 2

        Netcard queries test . . . : Passed

        Host Name. . . . . . . . . : medsrv1
        IP Address . . . . . . . . : 192.168.1.5
        Subnet Mask. . . . . . . . : 255.255.255.0
        Default Gateway. . . . . . : 192.168.1.1
        Dns Servers. . . . . . . . : 192.168.1.5


        AutoConfiguration results. . . . . . : Passed

        Default gateway test . . . : Passed

        NetBT name test. . . . . . : Passed
        [WARNING] At least one of the <00> 'WorkStation Service', <03> 'Messenge
r Service', <20> 'WINS' names is missing.

        WINS service test. . . . . : Skipped
            There are no WINS servers configured for this interface.


Global results:


Domain membership test . . . . . . : Passed


NetBT transports test. . . . . . . : Passed
    List of NetBt transports currently configured:
        NetBT_Tcpip_{305CC760-4CB2-4FDC-B65E-D584D16DE9CB}
    1 NetBt transport currently configured.


Autonet address test . . . . . . . : Passed


IP loopback ping test. . . . . . . : Passed


Default gateway test . . . . . . . : Passed


NetBT name test. . . . . . . . . . : Passed
    [WARNING] You don't have a single interface with the <00> 'WorkStation Servi
ce', <03> 'Messenger Service', <20> 'WINS' names defined.


Winsock test . . . . . . . . . . . : Passed


DNS test . . . . . . . . . . . . . : Passed
    PASS - All the DNS entries for DC are registered on DNS server '192.168.1.5'
.


Redir and Browser test . . . . . . : Passed
    List of NetBt transports currently bound to the Redir
        NetBT_Tcpip_{305CC760-4CB2-4FDC-B65E-D584D16DE9CB}
    The redir is bound to 1 NetBt transport.

    List of NetBt transports currently bound to the browser
        NetBT_Tcpip_{305CC760-4CB2-4FDC-B65E-D584D16DE9CB}
    The browser is bound to 1 NetBt transport.


DC discovery test. . . . . . . . . : Passed


DC list test . . . . . . . . . . . : Passed


Trust relationship test. . . . . . : Skipped


Kerberos test. . . . . . . . . . . : Passed


LDAP test. . . . . . . . . . . . . : Passed


Bindings test. . . . . . . . . . . : Passed


WAN configuration test . . . . . . : Skipped
    No active remote access connections.


Modem diagnostics test . . . . . . : Passed

IP Security test . . . . . . . . . : Skipped

    Note: run "netsh ipsec dynamic show /?" for more detailed information


The command completed successfully

C:\>

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