The Following below steps need to follow.
Step [1] – Download Node.js from below URL for Windows.
https://nodejs.org/en/download/
Step [2] – Once Download done, click on Installer & further steps as per below screenshots.
Installer Screenshot-1
Installer Screenshot-2
Installer Screenshot-3
Installer Screenshot-4
Installer Screenshot-5
Installer Screenshot-6, this sept will take some time, Please Be Patience
Step [3] – Finally Node.js has been installed , Got to your Command Prompt & type
node --version