Which is the best way Install Node-RED on windows

 Did you installed node.js  and npm in advance?
 
It is recommended to use PowerShell on all newer versions of Windows as this gives you access to commands and folder names that are closer to those of Linux/Mac.
 
1. Install Node.js
Download the latest 8.x LTS version of Node.js from the official Node.js home page. It will offer you the best version for your system.
Once installed, open a command prompt and run the following command to ensure Node.js and npm are installed correctly.
 
Using Powershell: 

node --version; npm --version

Using cmd: 

node --version && npm --version

2. Install Node-RED
 

npm install -g --unsafe-perm node-red

 3. run it on windows
 

C:>node-red

 
 

Another alternative method  is  on the official docs:
 
https://nodered.org/docs/platforms/windows