Wierd connectivity issue with new devices

I've got a HomeHub2 linked via the Infinity service at home, had for a while with an array of devices hanging off the wireless (2 x Dell laptop, 1 x Sony, 1 iPad and a Blackberry) and wired connections (BT Vision, Xbox 360, Windows Media Center, Panasonic Blu-ray) - all working fine
I got an advent laptop as a gift someone and was setting it up and neither wireless or wired connections would work.  I could see the wireless lans and I could enter my WPA key and it would appear to connect but gave the yellow triangle and listed it as "No internet access".... So I took the laptop back to PC world and they replaced with a HP laptop.
This is suffering exactly the same problem, the only common part of the two systems are Realtek network devices on both laptops and Windows 7.
I have Win7 on 5 of my existing machines, so thats "probably" not the cause.  But has anyone else seen this issue ?

I don't think that Windows 7 will be causing the problem... The only constant in both situations is the wifi adapter.
The hub is set as mixed mode WPA/WPA2 as standard. I'd give it a try and change it to normal WPA in the hub manager.. Then try to connect with the new laptop. See if that fixes it.
As far as I can remember, you shouldn't have to change any of your other wireless devices to do that. Although they will drop for a moment when you change the security mode. After that, they should detect the hub automatically and reconnect.

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