Network problem after new OSX update download

Greetings!
I've had a new (late 06) Intel 24" iMac networked wirelessly to my older iMac/cable modem/D-Link router very successfully since October. No problems and seamless set-up through the D-Link online wizard software.
Saturday I noticed an OSX upgrade to 10.4.8 (211mg) and went ahead and did the download on the wireless (Intel) iMac.
Upon restart, however, I have not been able to reconnect to my network. Airport is ON, but choosing my network name returns an error message. I have also attempted to reboot both cable modem and router, and reentered the D-Link wizard to both doublecheck the old network, and set up a new network, but saving these settings seems to fail by not recognizing the device, the router.
One of the error messages (on the wireless iMac) claims that my "settings have been changed by another application" (or to that effect) but does not give any clue as to how to determine what or where.
Also, since attempting to start from scrtch with the router, I no longer seem to get a full signal from the airport -- in Internet Connect, I no longer see a nice row of blue signal lights.
As you may be able to tell, I am new to networking, and the D-Link setup had helped make it simple -- tht is, I bumbled my way through it and was pleased with how well it worked. Now, after the OS update, not having the network is annoying -- and potentilly disastrous, as I need this machine online by Saturday.
Anyone able to give me a gentle hand, or nudge in the right direction?
Thanks in advance!
Bill
PS- Mac user since 1991! Wireless network user since only late October!

Hi again,
Sorry, BDAqua, I didn't see your note. I don't quite understand the last line of your suggestion -- a number greater than the number of CPUs? Not sure what you mean...
Phil, thanks for your note, too.
I believe the answer to your first question is 802.11g -- this is what it was set to.
After trying again to connect, using my old passwords, I was able to see the blue signal strength barss, and the Airport icon flashed on and off a few times, but ultimately the connection attempt failed again every time I tried it.
At this point, I'm no longer confident that my router is sending out a recognizable signal -- is this possible?
Also, in the dialog box in which available networks are usually shown (which has not happened since my original connection in October), today I was faced with a choice I hadn't seen before: 2WIRE736 -- is this likely to be someone else's network (a neighbor's)? I was wondering -- I'd never seen that one before. However, my own network names do not show up for choosing, and when I use Internet Connect to request them (and add WPA Personal and passwords), the connection appears to fail immediately.
At this point, should I attempt an OSX reinstall? Or has something I described made some sense for you?
Again, still very appreciative of all your help and patience with my ignorance.
Bill

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