Downloaded Mac OS X Update 10.7.4 and it wrecked my airport network

I downloaded OS X 10.7.4 update and my entire airport network became dreadfully slow and I need troubleshooting help. I've been using my iMac as a basestation and my ibooks could find it easily...not anymore...they can find it but the connection works very slow if not at all...
Any help would be great
Thanks

Have you tried:
http://support.apple.com/kb/HT4628?viewlocale=en_US&locale=en_US

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