Problem installing drivers w/ VISTA Help Please!!!

I have vista installed on one of my HDs, and XP on the other. My broadband internet connection works fine in XP, but not in Vista. I found out I need the nvidia network driver for vista. I DLed it, and tried to install it using the device manager like the instructions say, but it says to right click on "Other PCI Bridge Device" but that was not listed in the device manager. Then after the steps for updating the drivers for that, it wants me to do it to "Ethernet Network Controller", which is also not in the Device Manager. What do I do?

I dont know much of Vista but i guess this might work.
LINK