The GameCom 777 will enumerate as a speaker / microphone in Vista and not as a Surround Sound device.
The Vista operating system will see the product as a standard USB speaker/microphone in the Sounds dialogue box in the control panel.
All the technology used to convert 2 channel audio to 5.1 surround sound is housed on the USB adapter sold with the headset.
The product is designed to be 100% plug and play and as such does not require the installation of software on the PC.
The USB surround sound adapter uses Dolby Pro Logic II in combination with Dolby Headphone to create the experience.