ronjon's post inspired me to search for tech info, and I've come to the following conclusions:
1. My router is compatible with the wii
2. I get error code 52131 when I enter the exact numbers into the wii thru manual setup
3. I have no idea what the "add 10 to i.p. address" means.
4. Nothing on the error code 52131 peage helps, exept for number 4, which i can't try because my dad won't let be touch the router settings, let alone disable the security.
For those of you who have not a clue where I get all this, look around support.nintendo.com