Has the laptop actually "Connected" to the wireless network? In other words, have you run the wireless adapter's software, scanned for "Available Wireless Networks", found and highlighted the one that matches your router's SSID (network name) and selected the option to "Connect" to it? You should be prompted to enter any WEP or WPA encryption key and, once "Connected", the wireless adapter should get its IP address by DHCP from the router and you should have network and internet access.
There is a difference between the Wireless Network Adapter and Router communicating with a good signal and "Connecting" (as in "logging in") to your Wireless network.
If the router's wireless settings are definitely configured correctly and you have "Connected" to the wireless network, in the PC go to "Start > Run" type SERVICES.MSC and click OK. In the Services window that opens, scroll down to the "DHCP Client" service, double click it to open its Properties sheet and ensure that it is "Started" and that its Startup Type is set to "Automatic".