I have the newest vesion of Dragon (Dragon Naturally Speaking 9) and I have found since I have bought a upgraded headset it is by Logitech it picks up my word very well it doesn't write down outside words or misinterpret many.
Just a thought.. It was a bit pricey.. I think I paid about $60.00 for it but it made a huge differance.. Plus it doesn't sqeeze your head as it sits behind your ears and it's light. I use it on both my Desktop and Laptop..
I found mine at Compusa..
http://www.compusa.com/products/prod...tebook_Headset