If this has been covered already, I apologize - it is hard to know what the thread title might have been - and please point me to the old thread.

I am looking for a program that would:
1) Read a music score with a melody line only (in most cases) and play it
2) Could transpose it
3) Could print it in the new key
4) Would run on Windows 7
5) Does not cost a fortune

Does such a program exist?