You may not need to buy Dragon, most computers have Voice Recognition built into the OS now.
Dragon may work better for certain specialized business applications.

A quality mic and/or headset and set the VR up in the settings and do some test reading so it can learn your voice..
http://windows.microsoft.com/en-us/w...#1TC=windows-7

https://support.apple.com/en-us/HT202584