Windows Can't Detect Wireless Network

I have a windows xp laptop which can't detect the wireless network i've created with airport express- but it seems to be able to detect other networks around the area.
My two other machines (one macbook and the other xp) does pick up the network.
It seems like everything is working fine. 2/3 computers can pick up the signal, but just one of the computers can't! And i've repaired and reinstalled the driver for the wireless card, but it just won't detect the airport express signal!

That link does not help.
The network card on my windows xp machine works fine. It can detect other networks in the building and works at other WiFi spots.
I think its something to do with somthing in XP and Vista that is preventing it from detecting Airport Express' signal.
I've increased signal robustness- still doesn't work.
I've removed the password- still doesn't work (obviously not a security problem).
I've updated the software- still doesn't work.
I'm very confused as my XP machine did detect it initially and connected to it successfully earlier this year, but it doesn't anymore.
It seems like the network can be detected by some windows machine but not others???

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