HT1338 How do I update osx 10.4.8 if the network admin utility is not compatible with my apple airport extreme and I an't connect to the internet?

I was given an iMac desktop computer, operating system OSX 10.4.8 (2011). The network admin utility is not compatiable with my airport extreme router, and I am unable to connect to the internet to update the software.   Can someone please tell me how to update the software or download a newer version on the network admin, or how to connect this computer to the internet?
Thanks,

I assume you have a PPC.  There is another update for the Intel.
PPC:
http://support.apple.com/kb/dl177
Download. Do not expand.  Copy to your mac.  double click on dmg icon.
Have you tried an ethernet cable? 
Ethernet Bridge
Ethernet Bridge  "The versatile Wireless-G Ethernet Bridge can make any wired Ethernet-equipped device a part of your wireless network."  from linksys example: http://www.amazon.com/Linksys-RE1000-Wireless-N-Range-Extender/dp/B005FDXMJS/ref =sr_1_1?ie=UTF8&qid=1314563758&sr=8-1
This linksys bridge is the safest solution since it doesn't require any Mac OS drivers.
Airport ExpressAirport Express is an external unit and you can configure it as a bridge.  802.11n ( I bevieve you will need a more modern version of Mac OS X to configure.  Sadly, Apple uses a configuration program to configure, not a web browser. ) 
USB dongle
Newer Technology MAXPower 802.11g/b Wireless USB 2.0 Stick Adapter $15.99 http://eshop.macsales.com/item/Newer%20Technology/MXP2802GU2/ 
Newer Technology MAXPower 802.11n/g/b USB Adapter. The easiest way to add Wireless Connectivity to ANY computer! 'n' speed is the newest and fastest. $29.99 http://eshop.macsales.com/item/Newer%20Technology/MXP802NU2C/

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