Amazon.com: Feanteek FTDI USB to TTL Converter Built-in FT232RL Uart USB TTL Serial, DIY USB TTL Adapter for Programming Arduino Nano Raspberry Pi : Electronics
USB to UART circuit
How to Install FTDI Drivers - SparkFun Learn
FT232R Driver with Arduino - Interfacing w/ Software on the Computer - Arduino Forum
How to Install FTDI Drivers - SparkFun Learn
HOW TO DRIVE FT232R USB UART CLONE ARDUINO NANO BOARD 3.0 : 7 Steps - Instructables
Arduino setup for Windows 7 with FTDI USB-serial chip based boards - (+ Arduino Lightyearz)