Good day to all as well.
Just want to share this as I have the same problem a week ago and also ask help in some forums. And these all wrapped up to my conclusion.
Using online speech to text services you can convert audio files to text document easily and its more reliable than downloaded software.
Dragon is the most commonly used but can't be taken for professional purposes since you still have to train it.
You may also try a service like speechtotextservice.com or you can hire in elance, freelance, odesk, etc.
But one thing is for sure. As of the present technology in transcription, still nothing is free, unless you still do the work.
Hope this adds up FYI.