If it’s still not found after a Python installation you either
- have not yet restarted your computer or re-logged into your account to make sure changes to the PATH are visible to alle programs
- possibly deactivated the option to add Python to the PATH in the installater
In another topic it is reported that the Python version distributed on the official website must be used, not Microsoft’s one (Invalid path to Python Interpreter - #5 by maxgerhardt).