I can't see my 802.11n, 5ghz-only network on XP SP2

Hello everybody,
here's the problem:
I can't see a 5GHz-only network on Windows XP SP2 with Boot Camp's drivers. The Atheros 5008 Wireless Network Adapter built inside my Macbook is well known for being capable of managing "n-draft" networks.
The XP's installed driver, the one provided by Boot Camp, actually is the latest available.
Obviously I don't have the smallest problem on Mac OS 10.5.2, so why the Atheros 5008 Wireless Network Adapter shouldn't work on Windows XP SP2 when its driver can handle 5 GHz band?
Here's the proof:
http://drivers.softpedia.com/get/NETWORK-CARD/OTHER-NETWORK-CARDS/Atheros-AR5008 -Series-Driver-60394.shtml
Everything is ok with "g" or "b" network (created or not by Airport, as I can see the entire neighbourhood's networks), so the connection goes fine.
I did the Microsoft's mid-2007 hotfix for WPA2 encryption too as suggested by Apple to Boot Camp 1.2 users. Nothing got better.
I've spent hours on the internet looking for people experiencing this very issue, without success: could you please help me?
Thanks in advance.
Luca

My MacBook is a Spring '07 model as well. I remember, when I got it, it only supported b/g. Then Apple offered up an update to n, through software update. I wonder if this update only works for OS X (Tiger or Leo shouldn't matter if it was a firmware update).
Just offering up my thoughts. Anyone else?

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