Finding lost parental code

You don't visit http://wii.marcansoft.com/parental.psp from the Wii that is locked, you go there using a PC.

On your Wii, when it asks for a password, I think you enter an incorrect one and then choose "I don't remember" for both options it gives you. It then displays a confirmation code that you would normally give to Nintendo over the phone and they would tell you the unique reset code for your Wii. Marcan's website saves you from having to call Nintendo since you can just enter the confirmation code and it will tell you your unique reset code.