Add an external cron-job: Windows Server
Windows calls their time-based scheduling system the "Task Scheduler." It can be accessed via the Administrative Tools in the control panel.
How you set up the task varies with the server setup. One method is to use PowerShell and a Basic Task.
After creating a Basic Task the following command can be used to call the WordPress Cron script.
powershell "Invoke-WebRequest http://YOUR_SITE_URL/wp-cron.php" "="">http://YOUR_SITE_URL/wp-cron.php"