You can try the program, but I'm not sure if it will run or not: SirfTech

Download it from somewhere f.e. [Only registered and activated users can see links. ] (Pobierz program), rename to the same as the navigation, maybe shows more info about the GPS and finds the correct GPS port and baud. Don't change anything be careful, just adjust the com port and use the find baud option. Otherwise you risk that the factory navigation program won't find the GPS.