Atom-runner error [Python]

When I try to execute with Atom runner a really simple line of command like this

print("Hello World")

I have this error:

    Unable to find command: python
Are you sure PATH is configured correctly?

    ENV PATH: C:\Program Files (x86)\NVIDIA Corporation\PhysX\Common\C:\Users\alvar\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Python 3.6;C:\ProgramData\Oracle\Java\javapath;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Users\alvar\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Python 3.6\Python 3.6 (64-bit);C:\Users\alvar\AppData\Local\Microsoft\WindowsApps;

    Error: spawn python ENOENT
        at exports._errnoException (util.js:1026:11)
        at Process.ChildProcess._handle.onexit (internal/child_process.js:193:32)
        at onErrorNT (internal/child_process.js:359:16)
        at _combinedTickCallback (internal/process/next_tick.js:74:11)
        at process._tickCallback (internal/process/next_tick.js:98:9)

I have Python 3.6, please help. Thanks.