MacBook Pro won't connect wirelessly after 10.5.8 update

I have a MacBook Pro laptop, which was acquired in 2006. I have used it with my Linksys WRT54G router successfully for years but since I recently updated to 10.5.8, it was able to connect one time, which lasted for a day or so. Now it no longer can connect.
I am using Automatic DHCP with my wireless router's WPA Personal 2 with password security and yet it appears that Airport gets stuck because it assigns itself a IP number and of course, that appears to be the wrong number. I have tried to go and use manual settings, copying the settings from my iPod Touch and iPad. Ironically, when I tried that, the MBP attempt seemed to "kick' the two other devices off the network and I had to physically shut down the MBP completely and then reset the iPad a few times in order for it to reconnect again. The iPod Touch only had to be shut down and restarted and it was back in business.
Any ideas? One question: Can I set my network settings manually or do I have to use Automatic DHCP? Oh yeah, I have tried the tips that William Boyd provided in the thread +"MacBook connects, but MacBookPro won't"+ as seen here: http://discussions.apple.com/thread.jspa?messageID=10695921&start=1
Tried them all. Nothing helped.

I went into my MBP Network settings for Airport and instead of using DHCP, I clicked on Advanced and entered the data for my server, router and DNS manually. I also used an IP number provided by my Linksys router but I adjusted the last three digits so they would not conflict with the last three digits of my iPad and iPod Touch. Once I got all those elements in manually, I was able to connect with all three of my devices at one time with no conflicts.
What used to be automatic is no more. I have to do it manually. For all three devices...

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