If PIP is not recognized as an internal or external command when trying to install Python libraries here are some suggestions to help you.

Hmm, systeminfo works on my system. Kudos on finding a useful command! However, the help thing not even working sounds fishy. Mayhaps something has happened in your windows/system32 folder?

This post explains how to add Python to PATH using two simple methods. Now you can run Python code from anywhere using the command prompt!

Take control of multiple Python installations in Windows with the py launcher, available as part of a standard Python installation.