Seting up NTP on an isolated Windows 7 network

Select one PC to be the time server.

Setting up the Time Server
1. Open the control panel and select "Administrative Tools"
2. In the Administrative Tools, select "Services"
3. In the Service control panel, scroll down to the "Windows Time" service and select
4. In the "General" tab of the Window Time Properties dialog, set the "Startup type:" to "Automatic".
5. Launch RegEdit from the startup command line
6. Find the "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet
\services\W32Time\TimeProviders\NtpServer\Enabled" registry entry.
7. Select it and set the value to 1, (enabled)
8. Find the "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\W32Time\Config\AnnounceFlags" registry entry.
9. Select it and set the value to 5, (Always announce reliable time service)
10. From the command line, type "w32tm /config /update". This will load the new registry settings without having to restart the time service.
11. (Optional) From the command line, type "w32tm /query /configuration". This will display the time service configuration settings.

Setting up the Client PC's
1. Open the control panel and select “Clock, Language, and Region”
2. Click on “Set the time and date”
3. Select the Internet Time tab in the new window that opens up
4. Click on change settings and input the new server address you wish to use
5. Click “Update now”. Or, from the command line, type "w32tm /resync"
6. From the command line, type "w32tm /query /source". If communication with the time server is working, it should return the name of the time server.  If not, it will return "Local CMOS Clock"
7. (Optional) Launch RegEdit and find the "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\W32Time\TimeProviders\NtpClient\SpecialPollInterval" registry entry. Set it to 900 decimal. This sets the time sync interval to once every 15 minutes.