I can't semm to use npm, git and node on my system

hello all am running windows 10 machine i have tried to install node and git but whenever i try using git or npm it just return the user pointer back.

WindowsPC MINGW64 /c/Angular
$ git clone https://github.com/angular/quickstart my-app
Cloning into 'my-app'...

WindowsPC MINGW64 /c/Angular

that is what happen when i use git.

and if am using the cmd

C:\Users\Username>npm -v

C:\Users\Username>

Nothing seems to work however if i try to check node-v it works fine.

C:\Users\Username>node -v
v6.10.0

C:\Users\Username>

so do any one what could be the cause of this?

Because i can't learn angular 2 because of this

via dagogodboss