Having problems renewing ip address when repairing connection

My wireless network says it's connected, but it won't allow me to get online. The only weird thing I've noticed is that it says that I'm sending "Packets" but not recieving any. I don't know much about computers, so I have no idea how to fix this. Connecting to a Linksys WRT54G at my step dad's house. His laptop works fine on it, but mine won't connect, even though it says it IS connected. If it helps at all, I'm using an ASUS 900HD NetBook.

Also, the connection symbol at the bottom (Where the computer lights up green when it is properly connected) is a picture of a computer with a large yellow triangle with an exclamation point over it. It says "Limited or no connectivity" when scrolled over. It is sending about 537 'packets' on average. When I right click and press repair, it starts having problems when it reaches "Renewing IP address..." it is set to automatically recieve all DNS and IP address information, and I have even gone through and plugged it in by myself before. When I open up the "status screen" (after right clicking on said icon) and then clicking "More information..." under "Signal Strength:" it says the following:
"LIMITED OR NO CONNECTIVITY
You might not be able to access the Internet or some network resources. This problem occurred because the network did not assign a network address to the computer."
I have also manually renewed the IP address using the sommand text box thing, but to no avail.

Any help MUCH appreciated!