Well, this may not be a solution but, have you tried using your Original CD Drivers?
If that doesn't work, I would boot in safe mode, uninstall the drivers for the mobo, restart and install from CD then since I am sure Vista will not be able to connect to the internet and look for the drivers since you won't have Ethernet capabilities. Once you load those drivers, it should let you connect and go to Asus site and download the new drivers then.
Another thing that we can do is upload the drivers for you in Rapidshare or any other host that you might be able to download from if everything else fails.