Macbook air will not connect to the wifi network

I recently had to replace my wireless network router and now my macbook air will not connect to the network. it worked fine with the old wireless router. Now, i get a "unable to join wi-fi network" message. The network ID (SSID) and password (WPA) are the same as before. I try to manually enter the password, but continue to get the previous message.
Any help in figuring out how to correct this problem is greatly appreciated.
Also, I have several PCs in the house that have had zero problems connecting to my wireless with the new router. What am I doing wrong?

Hi,
Ever since did the last airport utility update this has been happening.
I believe the airport utility update is solely a software update. Repair permission and repair disk (boot from your installation disk A) may help.
Other wise, http://osxdaily.com/2009/12/22/mac-wireless-problems-guide-to-troubleshooting-ai rport-wireless-problems-on-your-mac/ may help, too.
Cheers.

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