Linter Flake8 isn't working, "failed to spawn command" error


I’ve recently gotten into Python3, and I tried to install Flake8 and Linter, but Flake8 isn’t working. This is the error I get when I try to open a Python file in Atom:

[Linter] Error running Flake8 Error: Failed to spawn command `flake8`. Make sure `flake8` is installed and on your PATH
at C:\Users\[MYNAME]\.atom\packages\linter-flake8\node_modules\atom-linter\lib\helpers.js:130:24
at process._tickCallback (internal/process/next_tick.js:103:7)

I attempted to reinstall Flake8, Linter, and Atom, but none fixed the issue.