Introduction: CH340 Driver Problem With Arduino Nano
Sometimes windows computers will not be able to communicate with Arduino Nano boards which were manufactured in China. This is due to to a driver issue and is simple to fix.
You must download and install the CH340 driver from the link below.
Unzip and Install the Driver.
Step 1: Check the COM Ports
If you open that Arduino IDE or LittleArm GUI you should now be able to see an Additional COM port listed in your USB options.
That is all there is to it.