git not detected

C:\WINDOWS\system32>activate py35

(py35) C:\WINDOWS\system32>pip install git+https://github.com/zsdonghao/tensorlayer.git@ba30379f1b86f930d6e86e1c8db49cbd2d9aa314
Collecting git+https://github.com/zsdonghao/tensorlayer.git@ba30379f1b86f930d6e86e1c8db49cbd2d9aa314
  Cloning https://github.com/zsdonghao/tensorlayer.git (to ba30379f1b86f930d6e86e1c8db49cbd2d9aa314) to c:\users\mona6\appdata\local\temp\pip-05zv34yb-build
  Error [WinError 2] The system cannot find the file specified while executing command git clone -q https://github.com/zsdonghao/tensorlayer.git C:\Users\mona6\AppData\Local\Temp\pip-05zv34yb-build
Cannot find command 'git'

(py35) C:\WINDOWS\system32>git
'git' is not recognized as an internal or external command,
operable program or batch file.

(py35) C:\WINDOWS\system32>choco install git.install
Chocolatey v0.10.5
Installing the following packages:
git.install
By installing you accept licenses for the packages.
git.install v2.12.2.2 already installed.
 Use --force to reinstall, specify a version to install, or try upgrade.

Chocolatey installed 0/1 packages. 0 packages failed.
 See the log for details (C:\ProgramData\chocolatey\logs\chocolatey.log).

Warnings:
 - git.install - git.install v2.12.2.2 already installed.
 Use --force to reinstall, specify a version to install, or try upgrade.