Exchange 2003 FE will not star excchange services

System Attendant does not want to seem to start. All dependencies are running.  
It seems like it cannot connect to a GC or DC based on the errors. Can ping the GC server without anny issues.

How can I manually change the GC the exchange 2003 server looks to via the registry. There are lots of GC's in the network and I want to point it to one specifically.

Here are some event viewer errors. Also when I try to click on the server is ESM the program hangs.

Event Type:      Error
Event Source:      MSExchangeDSAccess
Event Category:      Topology
Event ID:      2114
Date:            6/13/2010
Time:            9:13:40 PM
User:            N/A
Computer:      NOCSV10407
Description:
Process MAD.EXE (PID=4836). Topology Discovery failed, error 0x80040a02.

For more information, click http://www.microsoft.com/contentredirect.asp.

Event Type:      Information
Event Source:      MSExchangeDSAccess
Event Category:      Topology
Event ID:      2069
Date:            6/13/2010
Time:            9:13:40 PM
User:            N/A
Computer:      NOCSV10407
Description:
Process MAD.EXE (PID=4836).  DSAccess could not find any Global Catalog servers in neither the local site 'DMZ' nor the following sites:  
 

For more information, click http://www.microsoft.com/contentredirect.asp.

Event Type:      Information
Event Source:      MSExchangeDSAccess
Event Category:      Topology
Event ID:      2077
Date:            6/13/2010
Time:            9:13:40 PM
User:            N/A
Computer:      NOCSV10407
Description:
Process MAD.EXE (PID=4836).  DSAccess could not find any Domain Controller servers in neither the local site 'DMZ' nor the following sites:  
 

For more information, click http://www.microsoft.com/contentredirect.asp.