Pip 10.0.1 from c:\python37\lib\site-packages\pip (python 3.7)
It can process search, install, update and uninstall operation to python packages. PIP is a python script that can manage python packages.
Or you can read the article How To Set Windows Environment Variables. You can reinstall python 3.7 and check the Add Python 3.7 to PATH checkbox to resolve the error entirely.
This command will install or upgrade both python setuptools, wheel, and pip. Then run command python get-pip.py in a dos window.