On Office 2007, 2010 and the forthcoming 2013, when you save off the file you can chose to save your word file as a PDF. Make sure you staill save as a Word file too as you will not be able to edit the PDF.
Here is a link https://audext.com/audio-transcription-software/ where you can convert audio files to text free. Also you can find there many other formats of audio for converting to text. I transcribe 60-min-speech just in 8-10 minutes.