Let me be the first to say. SEARCH.
But because its too late for that...
With the legend of zelda TP in your wii, press and hold Y on your gamecube control (plugged into slot 1) as you boot up your wii. This will autoboot Zelda and assuming you still hack the twilight hack on your wii, you just walk backwards to execute the Wad Manager boot.dol that you have placed on the root of your SD card.
Remove bad wad.
Breath again.
Only works if you have Starfall with the correct options enabled, twilight hack still on your wii, and a retail version of twilight princess. (Or a burned copy will work if you have a modchip I believe)