are you saying you live in germany and bought a United States wii then can't play wii games?
if so check this out, it's called a Freeloader, it allows your wii to play games from any region, as long as they are wii games, gamecube games don't work on it as well.
This is the one that's supposed to work on european wiis
Play American and Japanese games on your PAL Wii console - Codejunkies UK
and this one is the one that works on a US wii
Wii FreeLoader: US Version - Codejunkies US
the other option you have is to modchip your wii, this alows you to play any regeion locked game you want on your wii, BUT this can brick your console (make it not work at all) and you need some electronics know-how to use the modchip