HP Laptop wireless connection problem

Hi

Trying to sort out a problem on a HP laptop.

Router is a Wireless Belkin 1001UK which is working 100%

The laptop will not connect to the internet. Wireless networks
connection dialogue box reports the connection requires a network key
(wpa) but also shows the connection 'Connected'. Pressing the disconnect
button results in the connection searching for a network, finding the
Belkin and immediately reporting the machine 'Connected'. The wireless
networking icon is showing trying to get it's IP address from the router
but never being able to.

This happens even though I have changed the WPA key and re-booted the
router several times.

How can the machine report that it is connected without the correct WPA
key being entered?

I have tried another laptop on the same connection and each time the
network key is changed the machine finds the network, reports that a key
is required, when the new key is inserted the machine gets its IP
address quickly and then reports 'Connected', the internet can then be
accessed.

Any help greatly appreciated

Martyn

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