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Try the simple stuff first. I had this same problem and it ended up being that I had my caps lock pressed when I setup the WPA shared key on the router. I was entering the wrong key on the laptop because caps lock wasn't pressed. If you are using WPA security and you enter the wrong key, the behavior will be that it keeps trying to acquire a network address. In the system tray, the indicator "flashes" momentarily and then tries to reconnect.
The easiest way to see if it's a security problem is to momentarily switch to a different security protocol (WEP from WPA) or even disable security and see if you can connect (leave mac filtering on). If you can connect, it's a security issue and probably related to your key. Then turn mac filtering off (leaving security on)
if you need help configuring security or MAC filtering, check your router documentation.