Recommended · for beginners
Unbrick Arduino FTDI FIX (Driver Update Win7 Arduino Nano FT232R USB UART)
Why people recommend it
Often linked as the fix when an Arduino Nano clone with an FTDI chip stops being recognised on Windows after a driver update.
Watch for: Windows FTDI driver problems with Nano clones
In their words
Also, you should download the "CDM-v2.12.00-WHQL-Certified.zip" drivers.
aaa on arduino.stackexchange.com, Aug 2015. CC BY-SA.