the AT command is the equivalent to the scheduler you tried. You could make the script log to a text file what's happening in it. You probably have a path/argv problem. Using the CLI mode on Windows is IMHO more difficult than on unix.
that's why I created many years ago my RobotOuaibe program (freely available) : I use it to launch whenever I want regular
(daily) tasks, including local scripts by just launching
http://localhost/thescriptIt's available from the third party tools on
http://www.edainworks.com and use it if it saves you some debugging pleasure ;-)