I'm assuming your talking about Dragon NaturallySpeaking?

Dragon NaturallySpeaking 9 can be installed on Windows Vista/7 for 64bit. Lot's of other people have followed these instructions [w/images] and it's worked fine for them. Try it... it's easy and it's more than your going to get from Nuance support; cheaper too.

http://www.lehsys.com/2008/10/because-nuance-wont-how-to-install-dragon-naturally-speaking-9-on-vista-64/

and

http://www.lehsys.com/2009/02/how-to-install-dragon-naturallyspeaking-9-on-windows-7-64-bit/

Not saying you did, but you might review every step of the process to see if you missed something. Many people have jumped sections/parts of the instructions. They got excited as soon as the installer started working and then just missed some stuff...

My apologies; I can't provide all the answers, but what I can say is that I've received hundreds of emails telling me the instructions I posted worked perfectly [it's exactly what I did]. I wish you the best of luck with your installation, and I wish that Nuance had only tried a fraction more to help people like ourselves; their customers.

Also, there's been reports of users having issues with Vista 64 and USB headsets; I really can't offer any information there. My personal system uses the sound system on-board and I use a traditional headset; it has to be plugged in before I start DNS on my system.

Hope this helps.

Thanks,
L. Henry Jr.
http://www.lehsys.com