Things You'll Need
Instructions
Power up your Wii console to access the Wii Channel menu.
Move the cursor over the "Wii" button in the bottom-left corner using your Wii remote and press the "A" button.
On the Wii Menu and System Settings screen, use your Wii remote to move the cursor over the "Wii Settings" option. Its icon looks like a wrench. Press the "A" button on the remote to access the system's settings.
Click the left blue arrow two times to access the "Wii System Settings" menu.
Choose "Format Wii System Memory."
If Parental Controls are set, enter your PIN.
Select "Format three times" if you are sure you want to erase the Wii console's system memory. Once the system finishes formatting the memory, you will receive a message saying, "The Wii System Memory has been formatted. The Wii console will now shut down."