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This was EXACTLY my problem. I have used a couple of days to solve this problem. My PDC Emulator is running 2003 x64 I ran the "Group Policy Results Wizard" on our x86 DC and found out, that the settings came from the "Local Group Policy" On the "Group Policy Challenged DC" I then ran MMC Add/Remove Snapin Select "Group Policy Object Editor" Select "Local Computer" as the "Group Policy Object" (This is the default value) Go to "Local Computer Policy", "Computer Configuration", "Administrative Templates", "System", "Windows Time Service" Make sure that the settings are "not configured", also under "Time Providers" My settings was configured under "Time Providers" and after setting to "Not Configured" the settings imidiately dissapeared from the Registry key in the Quote, and did NOT come back.