SSID is not showing up

[falcon2000]

Hi all,

Minor annoyance here. At sister-in-law's house. There are 2 AP broadcasting 2 different SSID. I have been staying here since last week and everything had been fine until yesterday. One of the AP (let's call it SSID 1) just refuses to show up in the available network list on my laptop and one of her computers. Both AP show up in all other computers and the wirless-able TV and the TiVo.

I have triple checked that both SSID are set to broadcast. On my Dell laptop, I use the Dell wireless utility and if I select SSID 1 from the Search drop-down list, and then scan, it will show up. But if I select "All Networks" to scan, it just won't show. On her computer, it uses Netgear's utility and it only have one option which is to scan for all available networks. It also refuses to show there. Both computers running XP SP3.

Both broadcasting w/ the same strong signal.