Arduino Uno Compatible that use CH340G UART to USB Converter. Some window version may already have its driver installed and some may not have. For window version that may not have the driver installed, the window will not detect the arduino but seen the arduino as unrecognized USB2.0-Serial.
How to know whether my window version do already have the CH340G driver installed or not and where i can get the driver?
Under "Other devices" tab, you will see there is USB2.0-Serial unrecognized by the window. That mean your window version do not have the CH340G driver.
CH341SER.rar and extract the file. Double click on CH341SER.EXE to install the driver.
Click INSTALL button. This will install USB-SERRIAL CH340 driver.
After USB2.0-Serial window appear, click on Update Driver button.
Click on Browse my computer for driver software button.