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^ That's not always true. Places like Gamestop don't necessarily keep the details they should for used products...
In the settings (probably the last page), one of the options should have to do with "formatting". That should delete everything on the Wii, including that password locking internet usage. That may also be password-protected though. In that case, you'd need t' send your Wii to Nintendo.
And my friend had this problem, he couldn't get to formatting section becuase it had parental controls (maybe PAL Wii's are different?).