One command that should work writes:
python -m pip install requests
This works because you pass the script call to python, which you know works, instead of relying on the PATH environment variable for windows, which can be dodgy.
Packages like numpy, which require the creation of c-extensions, will not work with pip unless you have a C-compiler installed on your system. More information can be found in this question .
If you, as you say, are not familiar with the python environment, then let me assure you that you will have a better day by installing Anaconda .
Anaconda is a completely free Python distribution (including for commercial use and redistribution). It includes over 300 of the most popular Python packages for science, math, engineering and data analysis.
Anaconda comes with numpy, of course.
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