WPA not working in Bootcamp WinXP

Hello,
i have a Core Duo macbook running Bootcamp.
At my apartment, the wireless security is set to WPA-TKIP.
Now my Dell 710m and my roomates Dell Inspiron 6000 uses WPA fine.
My macbook connects to the network and internet fine in OSX.
In windows, the network is connected, DNS routed and ip address is valid, but it cannot connect to the internet.

In WinXP:
I have tried turning off security, connects just fine,
I turned on WEP, connected just fine.
It is just WPA that does not work.

What can be the cause of this?
and if I have to change the drivers used, what should i change to and what do you guys use?

Thank You
Jonathan

I have a Macbook Pro and it connects fine in XP. Can you browse with a direct connection? If you can, there is something off with the wireless. if you can't, something's wrong with your browser.

You might be able to switch to AES. Not sure what the difference is, but you can try it.