The Network Time Protocol (NTP) is a part of Windows network servers that help administrators control the time on business machines. The NTP service runs in the background of the network server. Each client computer "pings" the server for the time and synchronizes with the NTP server. If the service stops or you make changes to the service in the registry, you restart it in the Windows command prompt.
Click the Windows "Start" button, enter "cmd" into the text box and press "Enter." This opens the Windows command prompt.
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Type "net stop w32time" and press "Enter." This stops the time service, which has the executable file named "w32time."
Type "net start w32time" and press "Enter." This starts the time service. These commands in combination restart the NTP service on the Windows computer.