title: Python pip upgrade error
body: <p>I want to use pip via command line: "pip install numpy"
  i get the following error message:</p>
  
  <pre><code>Command "python setup.py egg_info" failed with error code 1 in c:\users\a
  ppdata\local\temp\pip-build-vkphbn\ply
  You are using pip version 7.1.2, however version 8.1.1 is available.
  You should consider upgrading via the 'python -m pip install --upgrade pip' comm
  and.
  </code></pre>
  
  <p>Then i tried to install the new pip-version:ython -m pip install --upgrade pip' --> but get the following error message:</p>
  
  <pre><code>   Collecting pip
        Using cached pip-8.1.1-py2.py3-none-any.whl
      Installing collected packages: pip
        Found existing installation: pip 7.1.2
          Uninstalling pip-7.1.2:
            Successfully uninstalled pip-7.1.2
      Exception:
      Traceback (most recent call last):
        File "c:\python27\lib\site-packages\pip\basecommand.py", line 211, in main
          # and when it is done, isinstance is not needed anymore
        File "c:\python27\lib\site-packages\pip\commands\install.py", line 311, in run
  
  
        File "c:\python27\lib\site-packages\pip\req\req_set.py", line 657, in install
          )
        File "c:\python27\lib\site-packages\pip\req\req_install.py", line 729, in comm
      it_uninstall
          for name, value in config.items('console_scripts'):
        File "c:\python27\lib\site-packages\pip\req\req_uninstall.py", line 152, in co
      mmit
          )
        File "c:\python27\lib\site-packages\pip\_vendor\retrying.py", line 49, in wrap
      ped_f
          return Retrying(*dargs, **dkw).call(f, *args, **kw)
        File "c:\python27\lib\site-packages\pip\_vendor\retrying.py", line 212, in cal
      l
          raise attempt.get()
        File "c:\python27\lib\site-packages\pip\_vendor\retrying.py", line 247, in get
  
          six.reraise(self.value[0], self.value[1], self.value[2])
        File "c:\python27\lib\site-packages\pip\_vendor\retrying.py", line 200, in cal
      l
          attempt = Attempt(fn(*args, **kwargs), attempt_number, False)
        File "c:\python27\lib\site-packages\pip\utils\__init__.py", line 90, in rmtree
  
          try:
        File "c:\python27\lib\shutil.py", line 247, in rmtree
          rmtree(fullname, ignore_errors, onerror)
        File "c:\python27\lib\shutil.py", line 247, in rmtree
          rmtree(fullname, ignore_errors, onerror)
        File "c:\python27\lib\shutil.py", line 252, in rmtree
          onerror(os.remove, fullname, sys.exc_info())
        File "c:\python27\lib\site-packages\pip\utils\__init__.py", line 102, in rmtre
      e_errorhandler
          onerror=rmtree_errorhandler)
      WindowsError: [Error 5] Zugriff verweigert: 'c:\\user\\appdata\\local\\
      temp\\pip-3gcbbo-uninstall\\python27\\scripts\\pip.exe'
  </code></pre>
  
  <p>Would be great, if someone could help me.</p>