Installing pyinstaller via pip leads to “failed to create process”

Question

Does anyone know why pyinstaller immediately fails after installed via pip via anaconda 32bit?

I installed pyinstaller via

Answer 1

python -m pip install pip worked for me.

With Anaconda version of Python 3.5.2 and 3.6.0(Upgraded for this error, but the error appears to be the same with both versions), I had encountered the same error message with command pip install pip, or pip install whatever/ conda install whatever.

I had both Python 2.7 and 3.5, but pip install --upgrade pip had been working every day, until a few days ago.