I'm out of ideas here, networking is not my field of speciality.
Sorry.
Additional info provided by "Zim0n" in a PM:
ahh mate, i just remembered something that might be important...for not too long ago a friend of mine where at my house..he brought his MAC laptop with him...he tried to connect to our network, it also told him he was connected but he couldn't connect...and then suddenly we did something with his computer in the computer options and it worked...i have also realized that when i got the Properties of wireless network 7 which i am using, on properties of our network, i have not filled in the WEP key we have, but i cannot do that, it tells me that i have to create a new name for the network then..so i did..but that one which i create doesn't show up in the ''want to connect to internet suggestions'' hope this helps
Also...
i tried ipconfig/help and ipconfig/renew..when i do ipconfig/renew it tells me that i am not connected to a DHCP-server.
I hope you get your problem resolved, I'll keep watching in case I think of anything.