I am using the Dragon Naturally Speaking 10 programme and have no problems. I upgraded the computer to Windows 7 and all the files were transferred across without any hitches. In the past I have had problems with Via Voice and one other that I cannot recall. However, the Dragon programme worked right from the start. You must spend a little time training it by using the programme's training passages if you want it to perform properly.
Hope this helps. The programme seems to configure itself.