From Technet

Click Start, click Run, type regedit, and then click OK.
Locate and then click the following registry subkey:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32Time\Config\AnnounceFlags
In the right pane, right-click AnnounceFlags, and then click Modify.
In Edit DWORD Value, type A in the Value data box, and then click OK.
Quit Registry Editor.
At the command prompt, type the following command to restart the Windows Time service, and then press ENTER:
net stop w32time && net start w32time

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