(windows powershell) pipを使用して、virtualenvwrapper-powershellをダウンロード

windows powershellにおいて、pipを使用してvirtualenvwrapper-powershellをダウンロードしようとしているのですが、うまくいきません。
pipのダウンロード自体は上手くいき、"python -m pip install virtualenv" と入力し、virtualenvはインストールすることができたのですが、"python -m pip install virtualenvwrapper-powershell" と入力しても virtualenvwrapper-powershell をインストールすることができません。
以下、エラーメッセージとなります。

PS C:\windows\system32> python -m pip install virtualenvwrapper-powershell
Collecting virtualenvwrapper-powershell
C:\Python27\lib\site-packages\pip_vendor\requests\packages\urllib3\util\ssl_.py:90: InsecurePlatformWarning: A true
Context object is not available. This prevents urllib3 from configuring SSL appropriately and may cause certain SSL c
ections to fail. For more information, see https://urllib3.readthedocs.org/en/latest/security.html#insecureplatformwa
ng.
InsecurePlatformWarning
Using cached virtualenvwrapper-powershell-12.7.8.zip
Error [Error 2] The system cannot find the file specified while executing command python setup.py egg_info
Exception:
Traceback (most recent call last):
File "C:\Python27\lib\site-packages\pip\basecommand.py", line 223, in main
status = self.run(options, args)
File "C:\Python27\lib\site-packages\pip\commands\install.py", line 291, in run
wb.build(autobuilding=True)
File "C:\Python27\lib\site-packages\pip\wheel.py", line 705, in build
self.requirement_set.prepare_files(self.finder)
File "C:\Python27\lib\site-packages\pip\req\req_set.py", line 317, in prepare_files
functools.partial(self._prepare_file, finder))
File "C:\Python27\lib\site-packages\pip\req\req_set.py", line 304, in walk_req_to_install
more_reqs = handler(req_to_install)
File "C:\Python27\lib\site-packages\pip\req\req_set.py", line 483, in prepare_file
abstract_dist.prep_for_dist()
File "C:\Python27\lib\site-packages\pip\req\req_set.py", line 123, in prep_for_dist
self.req_to_install.run_egg_info()
File "C:\Python27\lib\site-packages\pip\req\req_install.py", line 402, in run_egg_info
command_desc='python setup.py egg_info')
File "C:\Python27\lib\site-packages\pip\utils__init.py", line 701, in call_subprocess
cwd=cwd, env=env)
File "C:\Python27\Lib\subprocess.py", line 711, in init
errread, errwrite)
File "C:\Python27\Lib\subprocess.py", line 948, in _execute_child
startupinfo)
WindowsError: [Error 2] The system cannot find the file specified