MacBook Pro says connected via Airport but no internet connection at all.

I have a strange problem. My MacBook pro 13" 2009 is no longer connecting to a wireless network it was previously able to get Internet through over wifi. I have not used the wifi here for quite a while 3-4 weeks so the recent update may have something to do with it, but this laptop has the most picky network cards out of all macs I have owned, refusing to connect to many routers. The strange thing was, it used to work on this one, and it's doesn't anymore while no settings have been changed. It works over Ethernet fine. My iPad and iPhone work perfectly on the same wireless. Even the windows laptop works on the network without a hitch.
Looking in the settings, it does not even obtain an address for the router, so how could it possibly be connected to it? And it gives itself the weird ip address of 192.168.1.77? Also, I am using a WEP key, but as I said no settings have changed since I last successfully used it.

The router is a Thomson TG585 a few months old not sure on firmware.

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