How to install the driver for Airport card in a mini

In a post regarding trouble with wireless connections some suggested...
cd /System/Library/Extensions
mv IO80211Family.kext IO8021Family.1066
well I did it and now my system is telling me there is no Airport card installed. How can I reload just the Airport drivers? I have my 10.6.3 OS X disk. Can I do it with that?
I tried running Disk Permissions with no change. I have since renamed the file back to what it was. The I started getting pop ups telling me the kernel file was improperly installed.
I just don't want to reinstall my complete OS.

I've already put it back to the original file name of IO80211Family.kext. I've run disk permissions too, in fact I've run it several times.
It keeps repairing a bunch of java stuff but that's all.
I've set the permission on the file to what I believe they were before I ran the mv command.
It was after I restored the file name, that I got the popup saying it was installed incorrectly, but, it's not saying it now.
And I have rebooted too, still no Airport.
Oh, I never replaced anything with earlier version, I just renamed and renamed back.

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