WLAN not working under Windows XP on Satellite U400

After installing Windows XP Recovery on my U400 the WLAN is not found. Under Win Vista it was working properly.
There is no module listed under the device manager - searching after new hardware gave no results. It seems that the WLAN Interface is not recognized by Win XP.
The Communication switch at the front was "ON" - bluetooth is working correct.

Hello,
the problem with my notebook is the following:
I bought the notebook with 3 GB Ram. With Windows Vista everything worked fine.
With XP there is a problem with adress ressources. Everything above 2 GB Memory allocates new adress ressources. So in the device manager there is an device "PCI Express port 6" or something like that wich is shown with a warning. This device conflicts with the wireless adapter - so no adapter can be found. If i remove 1 GB (whatever combination) the adress conflict is resolved and the wireless adapter is working.
Thanks to my local notebook dealer (notebook shop in Darmstadt/Germany) for discovering the problem.
I now switched back to vista and everything works with 3 GB. (Memory was more important to me than having XPinstead of Vista).
I think the problem can be solved with a new bios update!
Regards - Felix

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