installing drivers

I'm new to arduino. downloaded and installed software. now trying to install drivers. driver file named "arduinouno.inf" does not show up in the Driver file. only FTDI USB drivers sub directory. also in Device Mgr, Port ( com & LPT) the arduino doesn't show up.

You only select the folder named "drivers", you don't open it.

This is assuming you are using some version of Windows (you didn't say) and bought an official (not eBay or amazon).