Airport problems after update

I have been using my 20" Intel iMac for a few months now and have had no problems getting the built-in airport device to connect to my wireless home network. Yesterday, I downloaded and installed the new airport system update, and ever since I've been having big trouble. It doesn't show any available network connection at all (and I know my wireles network is working because my laptop can still connect). If I restart the computer, sometimes it will find my network and sign on, but then it drops the connection after just a few minutes and goes back to saying it can't detect any available networks. Has anyone else had any problems since the new update? Any suggestions on what to do? Thanks.

Unfortunately, I can't get any of your suggestions to work. If I restart the computer and go through the Network Diagnostics set-up, I can sometimes get it to find my home network and connect, though not everytime. The connection might last from 2 minutes to an hour or more, but then it is inevitably lost, and Airport shows no available networks, even though my MacBook is still connected to my home network and shows several other available networks from neighbors' houses, too. It seems like it must be a software problem since I had no problems before the update. Does anyone know anything else I can try short of taking it in to an Apple Store? Thanks for all your suggestions.

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    "How to get support from Apple ?"
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    CLICK---> International Support Phone #s to find the Italia number.
    If you have AppleCare and/or your computer is still under its one year warranty, the call is free. If you are out of warranty, you will be charged for tech support.
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