I have enabled my Laptop's WiFi switch on the front of the laptop. I see other networks from neighbors. I had Sprint's Hot Spot a few days ago and successfully surfed the net online through it without problem so my WiFi works and it's driver is up to date.
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Try disabling wireless security temporarily and see if that works. Check wireless mode matches.
I have tried that as well as WEP, 802, and WPA. There's no WiFi at all. My laptop picks up everyone except this one. My PSP sees the neighborhood networks too.
This may help you go into your router's wireless setup screens to check that wireless is enabled and SSID is being broadcast.