I did not know Wii has a DVD problem untill i searched with google and it seems Wii has a DVD but you cannot use it as a DVD
You need to HACK the Wii to be able to use all DVD functions, there are many guides on what and how to do it:
http://hbc.hackmii.com/download
Hack Your Wii for Homebrew Apps and DVD Playback
How to Enable Player to Playback DVD Movie on Nintendo Wii Without Modchip