Failed to Install Ionic

Hello, i’m new to Ionic

i have installed Nodejs vs 4.2.2 and its NPM
but when i did install it with `npm install -g ionic

it cause an error. It says the node-sass package has a problem. I did fix it ( maybe ) by installing the sass first with npm install node-sass.

but there still another error.

here i have uploaded the log error : drive

and here some screenshots
enter link description here

i’m looking forward and really need help about it as i need ionic to finish my collage task.