Cannot connect macbook to wireless network

Hey, I wonder if someone can help? I live in the uk & want to connect my nephew's macbook to his home wireless network.
His network is run off a Windows based pc, I have read in the forums that this is ok. He has a rather old pc that has no wireless card so I have installed a Netgear usb adaptor which runs just fine. The pc can "talk" to the Orange Livebox (Livebox -3660) and the pc can connect well, to the internet via the Livebox. So I have a stable internet connection.
The problem is that we cannot get the macbook ( a few months old only ) to connect at all to the net!
On the macbook there is no signal reading at all, airport is scanning for a network,it finds Livebox-3660 ok but when we enter the password the macbook says cannot connect!
Its curious that there is no signal reading at all on the macbook, yet it is right next to the livebox?
When I take the macbook home to my house, it connects immediately to my imac....full signal no problems. All systems go...
I must be missing something obvious ?? The security set up is currently WPA-PSK I dont know if this has a relevance? should I change this to make it more compatible to WPA2 ??
Much appreciate the help of the good people on this forum.
Thank you in advance. W

Sorted it!

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Message was edited by: Michelle Newberry

Cannot connect macbook to wireless network

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