Vista Speech Recognition - Equation Editor in Word
Vista Speech recognition works exceptionally well for me personally, and another person i know i recommended it to, it worked great for her as well.
This person has either not done the speech "training" or the computer cannot "hear" him clearly.
This seems to be working way better than any of the speech to text recognition software I have used. And the fact that you can not only convert speech to text, but control the software is just crazy..
I was able to set this up on my Windows Vista laptop, I got it to work pretty well. But I can type faster than voice recognition can understand me so I stopped it.