I must be missing something obvious in installing Python 3.4.2...

[Andrew Koenig]

Downloaded and installed 64-bit Python 3.4 and pywin32-219. Both installed smoothly on my 64-bit Win7 machine. I added C:\Python34 to the search path.

If I launch a Windows command window and run

        python -m ensurepip

I get the following:

Ignoring indexes: https://pypi.python.org/simple/
Downloading/unpacking setuptools
Cleaning up...
Exception:
Traceback (most recent call last):
  File "C:\Users\ark\AppData\Local\Temp\tmpe3ckts9f\pip-1.5.6-py2.py3-none-any.w
hl\pip\basecommand.py", line 122, in main
    status = self.run(options, args)
  File "C:\Users\ark\AppData\Local\Temp\tmpe3ckts9f\pip-1.5.6-py2.py3-none-any.w
hl\pip\commands\install.py", line 278, in run
    requirement_set.prepare_files(finder, force_root_egg_info=self.bundle, bundl
e=self.bundle)
  File "C:\Users\ark\AppData\Local\Temp\tmpe3ckts9f\pip-1.5.6-py2.py3-none-any.w
hl\pip\req.py", line 1177, in prepare_files
    url = finder.find_requirement(req_to_install, upgrade=self.upgrade)
  File "C:\Users\ark\AppData\Local\Temp\tmpe3ckts9f\pip-1.5.6-py2.py3-none-any.w
hl\pip\index.py", line 209, in find_requirement
    file_locations, url_locations = self._sort_locations(locations)
  File "C:\Users\ark\AppData\Local\Temp\tmpe3ckts9f\pip-1.5.6-py2.py3-none-any.w
hl\pip\index.py", line 128, in _sort_locations
    sort_path(os.path.join(path, item))
  File "C:\Users\ark\AppData\Local\Temp\tmpe3ckts9f\pip-1.5.6-py2.py3-none-any.w
hl\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

The pip.log file contains the same text.

I'm sure I'm doing something obviously wrong here--but what?