I have hello_world.js file located on my computer at the following location -
C:\Users\Ankur\Downloads\NodeJS\working
It has the following code-
console.log("Hellow World");
I was reading a beginners tutorial here and it says I should execute my javascript file through node.js. Now I have no idea what to do. How would I do this.
When I do this ...

I get nothing. What should I be doing to run the hello world successfully. None of the tutorials seem to be showing what needs to be done.
I am very new to this so it is probably something that is very obvious to you guys.
Use Node.js command prompt, then type in node C:\Users\Ankur\Downloads\NodeJS\working\hello_world.js
looks like you are in a node console already. you typed node which correctly started node (so your path is fine). Now you are telling node to interpret
node C:\Users\Ankur\Downloads\NodeJS\working\hello_world.js
as javascript which it doesn't like.
You should be able to type console.log('hello world'); here and see it appear.
To run your file, quit out of the node interpreter (i think control-X, maybe control-C), and at your C:> prompt, THEN type
node C:\Users\Ankur\Downloads\NodeJS\working\hello_world.js
Alternately,
cd C:\Users\Ankur\Downloads\NodeJS\working\
node hello_world.js
You have entered the node console, by typing node into a command prompt, and then tried to execute node from within itself. Just type node c:\etc\...\ from the command prompt, not the node shell.
Press: [Start]->[Run]->[c][m][d]
And enter command: node C:\Users\Ankur\Downloads\NodeJS\working\hello_world.js
Alternatively, use sublime editor, and install a node js build system, and just open the file you want to run, and press the build shortcut, getting the output in the console.
Open Windows cmd and type
node C:\Users\Ankur\Downloads\NodeJS\working\hello_world.js
You should use node from system interpreter (bash/DOS cmd), what you are running is C:\Program Files\nodejs\node.exe without any arguments.
This should work out !! IMPORTANT: Dont type node before the point number 3.