Air port express can not been accessed

My OSX has been upgraded to 10.7.4, and use Air port express as my AP, my iPhone and iPad(even non-Apple product) can access the AP, but my Mac book pro can not access it, even airport utility can not find it. But the AP is shown on the menu bar on the top screen and can not be selected.
Sometime a dialog box displayed to ask for password. But I keyed in correct password and it shows connection timeout.

"Pulling" a folder refers to basically moving (or renaming) a folder that holds preference data that the OS will recreate if it can't find it. For instance, anything in the ~/Library/Preferences folder. It's useful when trying to isolate software issues because often these problems are just as a result of corrupted preference files.
When dealing with network preferences, the stuff you want is in /Library/Preferences/SystemConfiguration. That is to say, the ROOT library, accessed by going Finder>Go>Computer>Mac HD.
If you rename this whole folder to SystemConfiguration.old and then restart, the OS will create a fresh folder, which often resolves OS-related networking issues. From that point, you can either delete the SystemConfiguration.old folder, or name it back and then delete the new one if you want to start trying to individually isolate what went wrong.
If nothing changes at all when you rename or move the SystemConfiguration folder, then you're likely looking at some nasty interference issues. Try changing the channel on your Airport Express.

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