Macbook Air can't connect the AP in Mac OS 10.6

Hi.
I opened my new macbook air yesterday, and I tried to connect my private WiFi AP.
The other devices, such as two iPads, iphone 4, ipod touch 3G, and PCs, can connect to the AP, but the new one couldn't connect.
The error message was "The password is not valid."
However, the key was correct.
I reseted my AP in several times and changed the security method (WPA and WPA2).
But these methods didn't solve the problem.
I tried to connect in the Win 7 using Bootcamp,and I can access the internet with the same AP. There is no malfunction in the WiFi hardware due to the reason.
What is the problem? I guess that the AirPort has some problems to connect.
Please let me know the solution.

Perhaps your network and keychain have gotten out of sync?
I suggest that you delete the network from Airport preferences. Then open "Keychain Access" and sarch for your wireless network name.
Delete the resulting "keys".
Then recreate it from scratch.
Cheers,
Rodney

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