Help in installing ethernet card?

I reformatted my computer due to ram failure(it works now). I forgot to backup my drivers and i lost my pc's driver disc. I download some driver scanners and told me to download NVIDIA_RIS_V6772.zip. That file gave me a bunch of files but no valid .exe file to install. It has .inf and some file types. It has a two folder, NRM and RIS. I don't know how to install them because it has no executable files. I tried Add Hardware in control panel which you can browse a disc and I pointed it to .inf but it didn't read it.