basically there is already a save file on the wii for that game. it wont let you overwrite it. you have to delete it. this save file does contain both your save file and his save file. deleting it will get rid of both on his wii
find Tiger Woods 09
click on it with the "A" button
click on the "Erase" button
then copy your save file from the SD card onto your friends wii
note: this will permanently erase your friends save file. if you have to, back it up onto another SD card. this does not work with all games.