I had the same issues.
I had the same problem, I eventually just got hold of a PAL version for WWTBAM. Obviously can't do this for the others.Thanks for the suggestions but none of them worked.
If someone with a PAL Wii has got any of the following NTSC games working, then would they please let me know how:
The Amazing Race, Hollywood Squares, The $1,000,000,000 Pyramid, Family Feud Decades, The Price Is Right Decades, and Who Wants To Be A Millionaire.