To run Home Assistant on Microsoft Windows installation you need to install Python first. Download Python for https://www.python.org/downloads/windows/ and follow the instructions of the installer.
C:\...\> pip3 install homeassistant C:\...\> py -m homeassistant --open-ui
For autostarting Home Assistant please refer to this guide.
Check this video for the installation on Windows 10.
The Microsoft Windows platform is not a primary target to install home Assistant. Also, not all tools and third-party modules will work.