Since MacOS 10.6.8 update, AirPort not working

I updated my MacBookPro with MacOS 10.6.8 and since then my wifi connection stopped working. For some reason, AirPort has disappeared. I did the following suggestions:
Restart the MacBook Pro
Deleted Mac System preference files
Ran Disk Utility
AirPort Utility cannot make a connection.
I attempted to rebuilid the connection via the System Prferences/Network, but AirPort does not appear on the Interface list to create a new service.
When the MacPro is connected directly to Internet via the Ethernet port, it works fine. We use LinkSys for the router. We have another older MacBookPro that was also updated and it is not having AirPort issues. I already consulted the AirPort troubleshooting guide on the apple site.
Any other suggestions?
Amy

Mine did the same thing on a later model MBP - I deleted my pref file restarted and it did not work - I plugged in an ethernet while it was running and then did one more reset at random and it came back on. very random.

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