Problems waking up and connecting to internet after MAC Software updates.

My Intel Macbook laptop use to connected to the internet automatically when I turned it on the laptop or woke it up. Now after the last MAC software upgrade this week (which included iTune, iPhoto, MAC 10.4.9 and an Airport upgrade) my PC is having problems connecting to the internet.
It attempts to connect but can't. I end up playing with the settings in Airport internet connections – e.g turning Airport on and off, going to NETWORK -Other and reentering the Network name and wireless security passphrase. Most of the time I have to go into System Preferences – Network and play with these settings e.g. Changing Locations, playing with the network status and eventually, magically it connects and stays connected until the next time I wake up my laptop.
The wireless Macbook laptop is connected to a DLINK Wireless Router (DI-624), using WPA-PSK security. I have tried rebooting both the laptop and the router a number of time and even redid the setting on both the router and laptop.
Is there something else I can check/do??? Can I undo any of the MAC Software updates (thinking about the Airport one)??? I would really like to get back to connecting to the internet automatically.
Thanks.
Macbook Mac OS X (10.4.9)

Yeah, the 169.254 addy means it isn't getting a DHCP reply, so it's not connected to anything at all.
Is that Interface dragged to the top of Network>Show?Network Port Configurations and checked ON?
The Interface that connects to the Internet, needs to be drug to the top of Network Port Configurations.
Yes those files get recreated on reboot, (unless critical pieces of the OS are missing for it's defaults), but you don't have to trash/delete them, you can just drag them to the desktop!
But after hearing the latest I might try...
/Users/nnnn/Library/Preferences... the whole Prefs folder there.
/Library/Preferences/SystemConfiguration... the whole SysConfig folder.
/Library/Preferences/com.apple.sharing.firewall.plist
/Library/Preferences/com.apple.AppleFileServer.plist
Reboot... of course you dont have to trash them, you can just move them to the desktop to drag back if it doesn't work.

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