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The origional Arduino NANO boards are getting very difficult to find these days and you may find yourself in posession of one of the newer Arduino compatiable NANOs with teh CH340G chip on the bottom (instead of the origional FTDI chip). Here is a great instructable that explains how to install the drivers and the differences.
http://www.instructables.com/id/Arduino-Nano-USB-Not-Recognizing-Fix/

The ch340 / xp, windows me driver. Ch340 can be used to upgrade the serial interface peripherals, or expand extra serial port for computers via usb bus, through external level conversion chip provide further rs232, rs485, rs422 interface, etc. USB-SERIAL CH341 Drivers Download, Arduino. 1/10 are connected to do not recognized message. Download latest version of verified & working Windows 8.1 x64 & x86 driver for CH340, CH340G USB to Serial converter. CH340 driver for Windows 8.1 x64 & x86. Driver details. CH340, CH340G & CH341 (USB-SERIAL chip) V3.4 Driver Version =, 3.4.2014.08.

Introduction: Arduino Nano USB Not Recognizing (Fix).

Ch340g Driver For Windows 7

Arduino Nano USB Not Recognizing (Fix).

Step 1: Arduino Nano Clones

Unfortunately an original Arduino Nano could cost you more plus shipping so it makes sense to search for an alternative source. There are also some chinese clones that are around five times cheaper, even with worldwide shipping.
But wait! There’s always a reason why a clone of something is cheaper than the original product. In this case there can be two pitfalls you need to know about.

Step 2: Original FTDI for Data Communication

Sometimes the FTDI chip which makes the USB communication possible is a counterfeit. This could cause problems when you install the official FTDI drivers and they just refuse to work.Usually there is no bootloader on the microcontroller. You need to upload it yourself and that means you need to have an appropriate programmer on hand.

Step 3: The Bad Part About Cheap Chinese Clones

So what makes this clone cheaper than the others? Well, most probably two things:

1.The headers are not installed.

2.It uses a different chip (CH340G) for serial-USB communication than the others.

The different serial chip on the other hand was something I was a little bit worried about but I’ve found my fears to be baseless. When I connected the board to the computer with a miniUSB cable it was instantly recognised by Windows as a virtual serial port.

Step 4: USB Not Recognizing

Step 5: Download Driver for CH340/CH341

Ch340g Driver Windows 10 X64

The chipset used for USB-to-serial is CH340/CH341, drivers for which can be downloaded here.
http://www.wch.cn/download/CH341SER_EXE.html

Step 6: Unzip & Install the Driver

Step 7:

DONE!!

This tutorial of Robo India explains how to install driver of CH340 USB to serial converter.

1. Introduction:

Download windows driver from here .

CH340 windows driver

2. Automatic installation:

If you are connected to internet, just plug CH340 USB to serial converter to your computer, windows will detect and download driver. You will see following message on successful installation. CH340 is installed on comport 23.

3. Manual installation

Ch340 Usb To Serial Driver

Follow following instruction to manually install driver of CH340.

3.1 Download driver from the link provided above in this tutorial.

3.2 Go to start menu.

3.3 Right click on My Computer.

3.5 Click on Properties

3.6 Select Device Manager form left control panel

3.7 Expand USB options available

3.8 Right click on CH340

3.9 Select Update driver

3.10 Select browse option

3.11 Extract the downloaded folder, downloaded in step 3.1

3.12 locate step 3.10 browse to the extracted folder

3.13 follow the further instruction of your computer

3.14 your CH340 device will be installed

3.15 Note down the comport allotted to your device.

If you have any query please write us at support@roboindia.com

Thanks and Regards
Content Development Team
Robo India
http://roboindia.com