The Win32 Scheduler service has two major failings. First, a single instance of a scheduled task can run no more than 1 time per day. To run a task hourly requires 24 entries.

The second major failing is of the Gotcha! variety. If a scheduled task fails, it is quietly descheduled. You have to remove and reschedule the task to get it to run again.

Go with one of the Perl replacements.