Vista - windows 32 bit - nforce networking controller issue

hi hopefully someone can help me here. i am using windows vista home premium 32 bit.

a couple days ago, i installed one of the usual windows vista updates. one of them happened to be for the nvidia nforce networking device so i installed it. well after my computer restarted, my internet won't work anymore. i dont know what to do.. i cant system restore because for some reason it wont let me. i tried to go to the website to download drivers and it says that they are up to date. when i go to the network and sharing center and i click on "diagnose and repair" it says:
The network adapter "NVIDIA nForce Networking Controller" is experiencing driver or hardware issues.

when i look in the device manager it gives me this error:

"This device is not working properly because Windows cannot load the drivers required for this device. (Code 31)"

so i dont know what to do.. can anyone help me with this?

3 things to try below

1) Roll back the driver in the device properties.

2) Remove the update from Control Panel -> Programs and features -> Installed Updates

3) Grab a new driver from the nvidia site

yea ive actually tried those and it STILL doesnt work =(

like the roll back option isnt even highlighted ont the driver so i cant even click it. i tried getting drivers but they still dont help... and i cant system restore because for some reason, when i do, it goes with the process of restoring and after it restarts the computer and i get to the desktop it says that there was an error and no changes could be made..

Try

sfc /scannow

from an elevated command prompt and just check that no system files have become corrupt and are causing problems.

Other than that I have no idea.