I'm not sure why Bertalan is steering
you away from Lilypond, though it may do much more than you need at this
time.
As James said, if you add a \midi
{} in your .ly file, Lilypond will generate a midi file that you
can play back in Windows Media Player or whatever program you choose for
midi playback.
That way you can hear the pieces you've
already entered into Lilypond, and if later you get to where you want more
advanced music notation capabilities, Lilypond will be there for you.
And people on this list will help you
use it, as they have done for me.
As you use it more, if you're like me,
you'll find that you can enter music more quickly by typing than you could
with a mouse.
Finale Notepad is quite limited in its
abilities.