Installing Gitstack Broke my Django/Python Installation

[isosphere]

I have a 64-bit Python 3.6.4 system running a django project. I have a specific DJANGO_SETTINGS_MODULE in my environment variables to allow me to administer my project from a command prompt regardless of my current working directory. I also have my PYTHONPATH variable set to C:;C:\MyProjectName

Step 1.
Installed gitstack 2.3.10 from http://s3.amazonaws.com/gitstack/GitStack_2.3.10.exe

Step 2.

C:\django-admin shell
Fatal Python error: Py_Initialize: unable to load the file system codec
  File "C:\GitStack\python\lib\encodings\__init__.py", line 123
    raise CodecRegistryError,\
                            ^
SyntaxError: invalid syntax

Current thread 0x00000128 (most recent call first):

Step 3.
Uninstall gitstack

Step 4.

c:\django-admin shell
C:\Users\mscheffel>django-admin shell
Python 3.6.4 (v3.6.4:d48eceb, Dec 19 2017, 06:54:40) [MSC v.1900 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
(InteractiveConsole)
>>>