It's been a while for me and NT, but I seem to recall that this was one of the first Windows OS' that had a built-in scheduler and that it was a bit difficult to work with (oh so Micro$haft
)...as in totally command line application.
Just curious if you had checked their website or Googled up some info from other sources on its usage. I know this isn't the greatest solution, but if no one else here is using NT (successfully at least) it may be up to you to figure it out and share with the rest of us.
Another suggestion, and maybe not the greatest either, is to investigate a good shareware/freeware scheduler that works with your OS.
Hope this helps. Keep us posted.