"A cable is not plugged into the Network Adapter -Local, area Connection".
Means exactly what it says a Network cable is not plugged it o the router from the PC and the PC cannot find the network.
I suggest you look in device manage and check that the wireless card is not showing any Exclamation marks againsta it and the driver is working correctly..
I so the is the wireless card switched on ? some laptops have a key combination to sitwch it on Fn + one of the F keys is common others have a small switch front or side of the laptop.