How can we change the GPS location in our Audi?

We have a new Audi and want to get into the computer system and change the location since it is an American spec car but we currently live in Europe. We have the needed cable and the navigon dvd but the computer system is not taking the dvd to download, anyone have a suggestion on how we can get into the system?Thanks in advance.How can we change the GPS location in our Audi?it seems a little complicated. you could refer this website http://www.autodvdgps.com