Vista - Vista not showing my wireless network

have a Buffalo WMR-G54 router connected to my PC that acts as my
wireless network.

I generally use my Windows XP laptop to connect and never have any
problem seeing the network and connecting to it. In fact, I can
generally see 6 nearby networks, including my own.


My network is on Channel 13, 802.11g, Open authentication, WEP.


Recently I have bought a Windows Vista laptop for my mother, who does
not have broadband set up yet and thus her network is not ready


I decided to use it with my network to set up firewalls, etc, via the
internet.


However, Vista is not showing my network at all and I cannot connect.
In fact, it is only showing 2 of the networks I can see from my XP
laptop.


This suggests it is not an issue with the network being set to not
broadcast (I have not set this as far as I can tell anyway).


My network is the strongest signal, so I have no idea why the 2
weaker
signals are picked up and mine is not.


I did try the manual connect option, but this did not connect to
anything, even though I put in all the correct connection details.


I even set up my router to directly use the Vista laptop Mac address.
Still no success.


ANy ideas anyone?


Cheers


Mark