I use a program called Forte Premium. It's a wonderful piece of software, and they keep on updating the tracks for each instrument to make them sound better. I think I made most of these tracks with Forte 6, and it's now up to Forte 8.
FORTE Premium Edition
Neuratron Photoscore
Converting sheet music to MIDI with a high degree of accuracy is an extremely complex task that programmers have spent many hours developing and refining. There won't be any free solutions.