Can't connect wireless, but Ethernet connection works just fine... HELP!?

I've had this problem for a while now so I've just opted to use the ethernet cable instead. Now that we have a new computer, I want this one (laptop) to be wireless. The thing is, when it does connect, the green light on the 2wire thingy is green. However, when I view the wireless connections and everything it says 'Not Connected'. When I try to repair the connection, it says that it couldn't be completed because it couldn't connect to the wireless network.

I know little to nothing when it comes to this. Will someone be willing to work with me? I'm low on funds so I can't pay anyone to come out and fix the problem.

Can't connect wireless, but Ethernet connection works just fine... HELP!?live update

there must be an unplugged network cable.. check the rotor

Can't connect wireless, but Ethernet connection works just fine... HELP!?norten

Your wireless signal from the router is weak, Im not sure how to fix this...