[Python] Python pip upgrade error

I want to use pip via command line: "pip install numpy" i get the following error message:

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.


Then i tried to install the new pip-version:ython -m pip install --upgrade pip' --> but get the following error message:

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'


Would be great, if someone could help me.

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