I dont know much about mod chips and such but i think its a freeloader u need (im probably wrong) try googling freeloader for wii see what comes up
problem is the nintendo firmware updates have been screwing with peoples modded wii , I think freeloaders are legal though , but like i say i dont really know what im talkin about ha ha
It used to be straight forward to convert consoles from memory, hence didn't worry too much with the Wii - having read a little now it seems things have changed.
Japanese and American Wii consoles are NTSC standard, so they will only play NTSC games, whereas Europe is PAL standard, so European Wii consoles can only play PAL games.
Unless you have a mod-chip installed, you cannot play European games, but modding your Wii will definitely void your warranty.