cannot convince task scheduler to actually start any action

Hi there.
Please a good soul explain like for morons how do I get the Vista (Business
32, SP1) Task Scheduler to run a program or display a message each 2
minutes? I've read many forums to no avail. The program does not run, be it
summoned under Administrator or User privileges, either on the system disk
or on another, either with security privileges added on that program's
application folder or not. Not a single message, either. I'm going mad, what
was wrong anyway with XP's scheduler system? Was it too simple and easy to
use or what? Now I cannot get it to display a single puny mesage!!
Thanks anyway. I actually need this scheduler to RUN.