Is there a fix for Airport No Connect Bug post 10.5.8 for 2009 Macbooks???

My Airport stopped working after 10.5.8 update.
It won't connect to my wifi even though it can see it,
kept getting self assigned IP.
The airport fix doesn't work with my machine, possibly because it's too new.
Normal ethernet works fine. I also tried internet sharing on my laptop, as that's how i get my iphone to use wifi at work, that doesn't work either.
Hardware details below.
macbook ver 5.1
Model Name: MacBook
Model Identifier: MacBook5,1
Processor Name: Intel Core 2 Duo
Processor Speed: 2.4 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 3 MB
Memory: 4 GB
Bus Speed: 1.07 GHz
Boot ROM Version: MB51.0073.B06

After doing a Software Update, AirPort has been having serious connection issues. It cannot find wireless networks where the *Wireless SSID Broadcast is DISABLED*. My iPhone finds the networks perfectly, every time. I am forced to input the network manually every time through "Join Other Network...", even though the network is saved on the Advanced list in Network Preferences.
*Here are the specs of my MacBook Pro:*
Model Name: MacBook Pro
Model Identifier: MacBookPro5,3
Processor Name: Intel Core 2 Duo
Processor Speed: 2.8 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 6 MB
Memory: 4 GB
Bus Speed: 1.07 GHz
*The router I am connecting to is...*
Linksys Compact Wireless-G Broadband Router
Model WRT54GC
Firmware Version: v1.05.7
Mode: Mixed
Wireless Channel: 06
Security: WPA2 Personal
Encryption: AES
Everything is pretty much defaulted to the default settings for the router. I have also another Linksys Router that is having the same problems. These used to work before perfectly BEFORE the MacBook 10.5.8 updates...
*Previous Methods in Trying to Resolve Issue:*
-Deleting AirPort connection in Network Preferences and re-adding it
-Deleting the "com.apple.airport.preferences.plist" file in /Library/Preferences/etc.
I'm at a loss here... any help would be greatly appreciated.

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