start dolphin, don't change any settings. boot game and allow the game to format the memory card
which is more or less what i said here http://forums.dolphin-emu.org/showthread.php?tid=22640&pid=205203#pid205203
which is more or less what i said here http://forums.dolphin-emu.org/showthread.php?tid=22640&pid=205203#pid205203
