Airport Express connects wirelessly but Macbook doesn't??

Hello, hope someone can help with this, here’s our set-up:
UK BT broadband – Belkin Router – Belkin Powerline Adapter – Airport Extreme
The Airport Extreme is set up as a bridge with the Belkin Router managing DHCP.
In a room separate to the Airport Extreme and router I have an Airport Express that will happily connect to the network, all looks good on Airport Utility on my Macbook (10.8.3) when viewed wirelessly. However, the strange things is that my Mackbook (MacBook5,1 2008), in the same room as the Airport Express, does not receive a valid IP address whereas the Airport Express does. So I can only connect to the internet by physically connecting (ethernet cable) to Airport Express.  This has been an issue for several months now, occasionally I can connect to the internet wirelessly but this seems randomly intermittent and most of the time it does not work. I have tried periodically rebooting everything working from the Belkin router, but this also rarely makes any difference. The Airport Extreme and Express have no problem connecting to the network every time, and they receive a valid IP address from the Belkin router.
How is it possible that the Airport Express can connect wirelessly but the Macbook in the same room can not, do they have very different wifi adapters?

Hi there,
I would recommend taking a look at the troubleshooting steps found in the article below.
Troubleshooting Wi-Fi issues in OS X Lion and Mac OS X v10.6
http://support.apple.com/kb/ht4628
-Griff W.

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