I can't install any package using pip
<p>Recently I installed Python 2.7 as I wanted to rewrite some script written in Python 3.5. After I modified the PATH environment variable I wanted to install pandas module I'm gettint the following error:</p>

<pre><code>C:\Python27&gt;pip install pandas
Collecting pandas
Exception:
Traceback (most recent call last):
  File "c:\python27\lib\site-packages\pip\basecommand.py", line 209, in main
    status = self.run(options, args)
  File "c:\python27\lib\site-packages\pip\commands\install.py", line 299, in run

    requirement_set.prepare_files(finder)
  File "c:\python27\lib\site-packages\pip\req\req_set.py", line 360, in prepare_
files
    ignore_dependencies=self.ignore_dependencies))
  File "c:\python27\lib\site-packages\pip\req\req_set.py", line 512, in _prepare
_file
    finder, self.upgrade, require_hashes)
  File "c:\python27\lib\site-packages\pip\req\req_install.py", line 273, in popu
late_link
    self.link = finder.find_requirement(self, upgrade)
  File "c:\python27\lib\site-packages\pip\index.py", line 440, in find_requireme
nt
    all_candidates = self.find_all_candidates(req.name)
  File "c:\python27\lib\site-packages\pip\index.py", line 398, in find_all_candi
dates
    for page in self._get_pages(url_locations, project_name):
  File "c:\python27\lib\site-packages\pip\index.py", line 543, in _get_pages
    page = self._get_page(location)
  File "c:\python27\lib\site-packages\pip\index.py", line 646, in _get_page
    return HTMLPage.get_page(link, session=self.session)
  File "c:\python27\lib\site-packages\pip\index.py", line 755, in get_page
    "Cache-Control": "max-age=600",
  File "c:\python27\lib\site-packages\pip\_vendor\requests\sessions.py", line 48
0, in get
    return self.request('GET', url, **kwargs)
  File "c:\python27\lib\site-packages\pip\download.py", line 378, in request
    return super(PipSession, self).request(method, url, *args, **kwargs)
  File "c:\python27\lib\site-packages\pip\_vendor\requests\sessions.py", line 46
8, in request
    resp = self.send(prep, **send_kwargs)
  File "c:\python27\lib\site-packages\pip\_vendor\requests\sessions.py", line 60
8, in send
    r.content
  File "c:\python27\lib\site-packages\pip\_vendor\requests\models.py", line 737,
 in content
    self._content = bytes().join(self.iter_content(CONTENT_CHUNK_SIZE)) or bytes
()
  File "c:\python27\lib\site-packages\pip\_vendor\requests\models.py", line 660,
 in generate
    for chunk in self.raw.stream(chunk_size, decode_content=True):
  File "c:\python27\lib\site-packages\pip\_vendor\requests\packages\urllib3\resp
onse.py", line 344, in stream
    data = self.read(amt=amt, decode_content=decode_content)
  File "c:\python27\lib\site-packages\pip\_vendor\requests\packages\urllib3\resp
onse.py", line 301, in read
    data = self._fp.read(amt)
  File "c:\python27\lib\site-packages\pip\_vendor\cachecontrol\filewrapper.py",
line 54, in read
    self.__callback(self.__buf.getvalue())
  File "c:\python27\lib\site-packages\pip\_vendor\cachecontrol\controller.py", l
ine 297, in cache_response
    self.serializer.dumps(request, response, body=body),
  File "c:\python27\lib\site-packages\pip\download.py", line 281, in set
    return super(SafeFileCache, self).set(*args, **kwargs)
  File "c:\python27\lib\site-packages\pip\_vendor\cachecontrol\caches\file_cache
.py", line 99, in set
    with self.lock_class(name) as lock:
  File "c:\python27\lib\site-packages\pip\_vendor\lockfile\mkdirlockfile.py", li
ne 19, in __init__
    LockBase.__init__(self, path, threaded, timeout)
  File "c:\python27\lib\site-packages\pip\_vendor\lockfile\__init__.py", line 24
2, in __init__
    hash(self.path)))
  File "c:\python27\lib\ntpath.py", line 85, in join
    result_path = result_path + p_path
UnicodeDecodeError: 'ascii' codec can't decode byte 0xb3 in position 5: ordinal
not in range(128)
</code></pre>

<p>Any ideas how to overcome this problem? I deleted the paths to Python 3.5 but it didn't help.</p>

<p>I also cannot install other packages.</p>