Installing Driver for CH340

The CH340 chip is used by a number of Arduino compatible boards to provide USB connectivity

Download latest version of CH340/341 driver

Windows 8

Link 1

Link 2

Windows 7

Download

Latest

Try downloading from any one of the link above.

1. Download the Windows CH340 Driver
2. Unzip the file
3. Run the installer which you unzipped
4. In the Arduino IDE when the CH340 is connected you will see a COM Port in the Tools > Serial Port menu, the COM number for your device may vary depending on your system.

Or you can also try as below:

Open Device Manager – right mouse click USB2.0-Serial, then left click Update Driver Software

open the directory with downloaded & extracted CH341SER.zip driver

This will install required driver.