-> get into your device manager and search for your unknwon device
-> if it's a WCH340 :
get the driver here : http://www.wch-ic.com/downloads/CH341SER_EXE.html
-> if it's a CP2102 or a CP2104 :
get the driver here :
https://www.silabs.com/developers/usb-to-uart-bridge-vcp-drivers