Do you get the wireless network icon in the bottom right of the taskbar (the pc with the )) to the right)?
Double-click on it and click the Support tag. You should see that the IP address is assigned by DHCP, an IP address and subnet mask and a Default Gateway address.
The Default Gateway address is the IP address of the wireless router. If you put this address into your browser's address bar (just the address, no http or www or anything else) and hit Go, do you see the router's setup page?