Hi Kev,
It might be your settings aren't quite correct
Suppose your php is located ...
C:\PHP\cli\php.exe
... and your PHP file is ...
C:\test.php
... then the Run command should be ...
C:\PHP\cli\php.exe C:\test.php
... and you should Start in ...
C:\
Hope that helps.
Paul 🙂
PS. I had a few problems with the owner/password malarkey but you can check to see if that's your problem by opening the 'Scheduled Tasks' folder and displaying the details.