I have purchased both Dragon NaturallySpeaking 9 and Dragon NaturallySpeaking Preferred 10.1 and have spent hours on the phone with tech-support, but after updating, patching, etc the program only worked correctly less than 10% is Done most of the time. Most often I would receive an Error message indicating that WINDOWS EXPLORER was shutting down. Nuance was never able to assist me in resolving the issue and NEVER refunded me a penny