Newbie question. I have a Wii console purchased in New Zealand (PAL) and have had a D2CPRO mod installed. I want to play some games I have been given from the US, I believe they are NTSC. When I load the US game disc I get the prompt to update the Wii. I abort at this point as I am concerned about stuffing up my Wii - am I right to be concerned or should I let the update proceed?