run cron.php using Windows Scheduled Task.

I used Windows 7.
1. Go to Start - Control Panel -Administration tools- Scheduled Tasks
(For Windows Server 2003, Control Panel - Add Scheduled tasks, for
view old scheduled tasks, double click scheduled tasks)
2, Create basic task, Name: cron.php, Description test
3. Trigger: weekly
4. Action: Start a program
5. Program/script:
c:\php\php-win.exe -f c:\LMS\cron\cron.php
6. Click Finish

Reference:
http://docs.moodle.org/en/Cron#Managing_Cron_on_Windows_systems