This might sound like a real stab in the dark, but if you are truly connceted and you're sure of this. Have you tried changing your internet options to "automatically detect settings" under your LAN settings. I guess the real question is, how are you connected? Might want to give a little more information about connection.

Majid,

Click the Start button, then Run...type CMD and return. Or just bring up the black DOS screen. In the command screen type ipconfig /all and paster that result here.

zeroth