Problem in ps3 connecting to wi-fi

hi,
I have a livebox Internet and PC operates wi-fi.I want to connect my ps3 in wi-fi, it recognizes the box with a signal , but I can not go on the net. I try some changes in settings like cut the firewall, disconnected the virus, almost everything I know,but not working .Someone would have an idea?
Thank you !

hi
once your connected to your ps3 box makes a connection test and check your console .

hi
When I run the test, the exchange of key words and appears on the line below: "obtaining IP address" and "failed" that appears in about 1 min.

ok

Go to your ps3, settings, network settings, Internet connection settings, personalized, wireless, scan, you chose your livebox, then arrow right, you choose your mode of security that is currently enabled on your livebox , right arrow, X, your WEP code , start, right arrow, manual IP address configuration:

then test the connection

i got ip setting,but Failed to communicate with the server.
DNS error.