[Macbook] Wireless networks don't appear, or appear then disappear

Two windows vista laptops can scan and find several wireless networks and connect to one (unsecured). However my Macbook, sitting inches away, does not list any networks to connect to. Sometimes, upon restarting, the networks will show up, but when trying to connect it says "Connection timeout". Then, the networks will disappear from the list. Has anyone had a similar problem?

when you are searching for access points is your location set to automatic... if you have an local static IP entered into the laptop then the laptop will only seach thoes networks...

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