OK, Mark Clark has taken you through the tech route. He loses me at times BTW but he always has lots of good advie and good info. I keep telling myself I'll learn more one day...
Assuming you are running Win 3.1 are looking for shareware and want to keep it simple, my own advice would be to visit http://www.harmony-central.com/Software/Windows/sequencing.html and look for the 16 bit version of Noteworthy Composer 1.50 there.
As far as I can make out from the "more info" link, it will run on your machine and it looks to me as if the download is still available.