How to reinstall Airport?

So lately my Macbook Pro has been having problems connecting to the internet. It kept saying the Airport was off (even though I never turned it off).
I would go into my Network preferences and click the "Turn airport on" button, but nothing would happen. I googled how to turn the airport on, and found a page that told me to select it in the left column of my network settings, delete it (by clicking the "-" button), restart my computer, and then re add my airport by clicking the "+" button. I did this last night and it worked perfectly.
I tried doing it again this morning as I was having the same problem, and now when I click the "+" button, it only gives me the option to add FireWire, Ethernet, or Bluetooth DUN.
I'm not sure what has changed since last night, but I really need help to get my airport back! I tried going into my airport utility, but it won't do anything since I'm not connected to the internet.
Please help!!
Thank you in advance!

Reinstall 10.6.8 by using the combo update. Repair permissions and restart your computer when done. You should now be able to add Airport.

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11. Play a song in iTunes. Go to your audio receiver, and connect it to the channel for your external connection to the Airport Express unit. You should hear your music from iTunes. CONGRATULATIONS! =)
I hope these instructions were helpful - I am happy to answer any questions, so feel free to contact me, *******************@*****.**.
<Edited by Moderator>

Thanks for the detailed directions. You are absolutely correct in stating that people should toss the user manual; it's pretty worthless. I have had a problem setting up my new Airport Express as I have described in an earlier post - http://discussions.apple.com/thread.jspa?threadID=1839873&tstart=45
One quick question - does using your setup process set the AE up as part of a distributed network where the AE is acting as a wireless router where it is extending the range of your network? Or, is it simply a wireless connection to your stereo for iTunes? I am interested in having both, since my AE will be at the other end of the house from the main wireless router.
Thanks

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How to reinstall Airport?

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