title: No module named 'setuptools', even though the module is installed
body: <p>I'm trying to install the openpyxl package with pip, using Windows.</p>
  <pre class="lang-none prettyprint-override"><code>PS C:\Scripts&gt; pip install openpyxl
  Collecting openpyxl
      Using cached openpyxl-2.5.0.tar.gz
      Complete output from command python setup.py egg_info:
      Traceback (most recent call last):
       File &quot;&lt;string&gt;&quot;, line 1, in &lt;module&gt;
      ModuleNotFoundError: No module named 'setuptools'
  </code></pre>
  <p>When I run the setuptools installation I get:</p>
  <pre class="lang-none prettyprint-override"><code>PS C:\Scripts&gt; pip install setuptools
  &gt;&gt;
  Requirement already satisfied: setuptools in c:\scripts\lib\site-packages
  </code></pre>
  <p>I tried uninstalling and installing the setuptools again, but no success. What am I doing wrong?</p>
  <pre class="lang-none prettyprint-override"><code>PS C:\Users\dolinar\Desktop\setuptools-38.4.0&gt; python .\easy_install.py
  error: can't create or remove files in install directory
  
  The following error occurred while trying to add or remove files in the
  installation directory:
  
  [Errno 2] No such file or directory: 'C:Lib\\site-packages\\test-easy-install-9076.write-test'
  
  The installation directory you specified (via --install-dir, --prefix, or
  the distutils default setting) was:
  
  C:Lib\site-packages\
  
  This directory does not currently exist.  Please create it and try again, or
  choose a different installation directory (using the -d or --install-dir
  option).
  </code></pre>
  <p>The directory exists.</p>