Nuance has officially announced that they will now support Dragon NaturallySpeaking 10 on on a 64-bit operating system, but I have successfully installed Dragon NaturallySpeaking 9 on Windows this to 64-bit and Windows 7 64-bit. Installation process for this versus Windows 7 for Dragon NaturallySpeaking 9 is virtually identical.
There’s nothing dangerous about this process. The installation files from Dragon NaturallySpeaking are copied to the local hard drive, the installation MSI file is modified to root remove the launch conditions that prohibit installation onto a 64-bit operating system. The rest of the installation is pretty much stock from Nuance.
Nuance is currently working on a release of Dragon NaturallySpeaking can that will be 64-bit compatible with Wndows Vista. the update only applies to version 10 of Dragon NaturallySpeaking. Version 9 of Dragon NaturallySpeaking will not be supported by a 64-bit operating system; which makes these instructions helpful and valuable.