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This is the exception that comes out after running the py -m ensurepip manually:
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C:\Python34\lib\ensurepip\__main__.py run on 08/07/14 15:44:36
Ignoring indexes: https://pypi.python.org/simple/
Downloading/unpacking setuptools
Cleaning up...
 Removing temporary dir C:\Users\venza\AppData\Local\Temp\pip_build_venza...
Exception:
Traceback (most recent call last):
 File "C:\Users\venza\AppData\Local\Temp\tmpz0stj2e6\pip-1.5.6-py2.py3-none-any.whl\pip\basecommand.py", line 122, in main
 status = self.run(options, args)
 File "C:\Users\venza\AppData\Local\Temp\tmpz0stj2e6\pip-1.5.6-py2.py3-none-any.whl\pip\commands\install.py", line 278, in run
 requirement_set.prepare_files(finder, force_root_egg_info=self.bundle, bundle=self.bundle)
 File "C:\Users\venza\AppData\Local\Temp\tmpz0stj2e6\pip-1.5.6-py2.py3-none-any.whl\pip\req.py", line 1177, in prepare_files
 url = finder.find_requirement(req_to_install, upgrade=self.upgrade)
 File "C:\Users\venza\AppData\Local\Temp\tmpz0stj2e6\pip-1.5.6-py2.py3-none-any.whl\pip\index.py", line 209, in find_requirement
 file_locations, url_locations = self._sort_locations(locations)
 File "C:\Users\venza\AppData\Local\Temp\tmpz0stj2e6\pip-1.5.6-py2.py3-none-any.whl\pip\index.py", line 128, in _sort_locations
 sort_path(os.path.join(path, item))
 File "C:\Users\venza\AppData\Local\Temp\tmpz0stj2e6\pip-1.5.6-py2.py3-none-any.whl\pip\index.py", line 109, in sort_path
 if mimetypes.guess_type(url, strict=False)[0] == 'text/html':
 File "C:\Python34\lib\mimetypes.py", line 287, in guess_type
 init()
 File "C:\Python34\lib\mimetypes.py", line 348, in init
 db.read_windows_registry()
 File "C:\Python34\lib\mimetypes.py", line 255, in read_windows_registry
 with _winreg.OpenKey(hkcr, subkeyname) as subkey:
TypeError: OpenKey() argument 2 must be str without null characters or None, not str