Hi, sorry you're having problems. You say, "I try to connect the disc to the wi-fi"; so are you seeing this during set-up? also you say "I'm already connected to the wi-fi". Can you please clarify what you mean.
Also have a look at the thread on top of this forum. Point 1 may help.
Hope this helps for now, but let us know - with more details - if you're still having problems.