Windows 2003 Time server (Standalone)

Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesW32TimeTimeProvidersNtpServer]
"Enabled"=dword:00000001

Then running the following command:

REF:

http://technet.microsoft.com/en-us/library/cc773061(WS.10).aspx

Attention:

The Windows Time Server “MUST” synchronizes to an external time server, and must return “Successfully”