Type task scheduler into the windows bar and run it, then go look up a guide on the internet on how to use it.
It will show you any autostart programs you might already have and in that case you can just copy one replacing the exe with the one you want.
For a timer the easiest would be to make a bat file (a simple text file but change the extension to .bat) instead of running the exe file, and then the first line should be
timeout /t 3600 /nobreak (3600 seconds=1h )
and the second just the name of the .exe