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Here are the steps to configure a Windows machine to function as an NTP server using PowerShell:

1. Open PowerShell with administrative privileges.

2. Run the following command to check if the Windows Time service is running:

   Get-Service -Name W32Time

3. If the Windows Time service is not running, start it by running the following command:

   Start-Service -Name W32Time

4. Set the Windows Time service to start automatically by running the following command:

   Set-Service -Name W32Time -StartupType Automatic

5. Open the UDP port 123 on the Windows firewall by running the following command:

   New-NetFirewallRule -DisplayName "NTP" -Direction Inbound -LocalPort 123 -Protocol UDP -Action Allow

6. Configure the Windows machine to use itself as the NTP server by running the following command:

   w32tm /config /manualpeerlist:"127.0.0.1" /syncfromflags:MANUAL /update

7. Enable the NTP server feature by running the following command:

   w32tm /config /reliable:yes /update

8. Restart the Windows Time service by running the following command:

   Restart-Service -Name W32Time

Your Windows machine is now configured as an NTP server. Other devices on your network can now synchronize their time with it.