Many DS games will reset their save data if you hold down the A, B, X, Y, L and R buttons (simultaneously) when the game is starting up.
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If you want to restart, depending on what you mean, you could restart your Wii, or you could start another file on you Guitar Hero. If you do not want to make another file, just delete the game block on you Wii. Those are some of the ways that you can completely restart your game. Hitting restart on the Wii does not completely restart the game files, though.
To delete a File and play it now
YOU CANT! send it to nintendo.
No. It changes each file.
i do not have the game, but if you go to options or settings and your save file, just delete the saved file and you can restart all over