Here is what you can try.

1. Lets check python installation.

C:\Users\User>python --version
Python 3.10.5

C:\Users\User>

If you get the version as 3.x, then we are good, else goto your python installation directory and copy its path and then add it to your environment variable PATH.

2. Check PIP available or not.

C:\Users\User>pip --version
pip 22.3 from C:\Users\User\AppData\Local\Programs\Python\Python310\lib\site-packages\pip (python 3.10)

C:\Users\User>

if above didn't work then add pip path to PATH environment variable which would be something similar to above output.

3. Now we are ready to install any package

Just do pip install package-name for testing, you can try: pip install numpy If it still throws error, try below one python -m pip install numpy if it still throws error, then you might need to clean your python installation.

The accepted answer is outdated. So first, pip is preferred over easy_install, (Why use pip over easy_install?). Then follow these steps to install pip on Windows, it's quite easy.

1. Install setuptools:

   curl https://bootstrap.pypa.io/ez_setup.py | python
   

2. Install pip:

   curl https://bootstrap.pypa.io/get-pip.py | python
   

3. Optionally, you can add the path to your environment so that you can use pip anywhere. It's somewhere like C:\Python33\Scripts.