iDeneb v1.6 10.5.8 Lite Edition on G31M-S2L

Motherboard: Gigabye G31M-S2L
Processor: Intel Core 2 Duo E6750 @ 2.66GHz

4GB DDR2 Memory
Realtek RTL8168/8111 PCI-E Gigabit Ethernet NIC

I installed iDeneb v1.6 OSX 10.5.8 Lite Edition and everything with the install went smoothly.. I don't however have internet yet. I am still working on that.. I downloaded the driver I believe is correct. RealtekR1000_1.8.1.kext

I have tried to add it to the desktop and run the following inside the terminal.

- Open "Terminal"
- type "sudo -s" and password
- "cd ~/desktop"
- "chown -R root:wheel RealtekR1000.kext"
- "kextload -v RealtekR1000.kext"

The results that I get are "RealtekR1000.kext is not authentic" Also was unproperly installed.
(check ownership and permissions; run with -t for details)

I also tried to unload the kext (whatever that means) using these steps from another post...
--try to unload kext, and than load it with ket -t:
sudo -s
cd /System/Library/Extensions
kextunload RealtekR1000.kext
kextload -t RealtekR1000.kext

Still unsuccessful..

Can anyone get this figured out so that I can get internet to work. Is there any other kext files that I can change or edit to make it work. I am still really new so the more details the better.