Set it up as a Windows Scheduled task, not a cron job.
You can run PHP from the command line like:
C:\PHP5\php.exe -f "C:\PHP Scripts\script.php"
Edit: The link you have supplied is a PHP tool to manage cron jobs. You would need to install a windows version of cron which one of the other answers points out. If you just want to run a task on a regular basis, use the windows scheduler to do it.