It appears that the security settings entered into the Nintendo 3DS are not the same as what your wireless router is set to allow. Make sure the security key and security type are entered into the Nintendo DS exactly as they appear in your router's settings. To find your router's settings, use the link CPM provided above.
Has this connection ever been accessed successfully before?
Connecting via a laptop is finicky, since the 3DS is usually connected with routers, and this might help. I suggest that you simply try to use a nearby router instead of the laptop, if you can.
