|If you have configured the wireless network at the router for encryption, you need to use the same settings at the laptop.|
E.g.: If encryption type is WPA2, you must configure the laptops encryption type also to WPA2.
You also have to use the wireless network name (SSID) and the encryption key, you've configured at the router.
The original poster should always write the last response !!!
Let us know, if the problem is solved !!!