anaconda navigator will no longer start even through cmd, won't install or update or manage environments
It usually happen when you directly download and insall anaconda normally form its website.
Updating anaconda solved this issue for me in Manjaro and will surely work on Windows as well.
use conda update anaconda-navigator command to Update Anaconda.
If it doesn't starts, restart your pc and try to open it again.
I'm new to django and using the anaconda cloud environment. Its been working well for 3 months plus but as of 7-24-2018 it is just stop to launch the navigator or open through cmd. I can't manage environments or install packages. Using the anaconda prompt also gives me the same error upon launching. It started when I wanted to install django-Oscar, but not having its dependencies I was forced to install the packages manually which in turn needed cytoolz that needs Microsoft Visual C++ build tools which I got to install as well but the error persists. Please help me!
Copy/Paste of CMD Traceback:

C:\Users\kaukau\Desktop>conda --version conda 4.5.4
C:\Users\kaukau\Desktop>anaconda-navigator Traceback (most recent call
  last):   File
  "C:\Users\kaukau\Anaconda3\lib\site-packages\qtpy__init__.py", line
  169, in 
      from PySide import version as PYSIDE_VERSION  # analysis:ignore ModuleNotFoundError: No module named 'PySide'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):   File
  "C:\Users\kaukau\Anaconda3\Scripts\anaconda-navigator-script.py", line
  6, in 
      from anaconda_navigator.app.main import main   File "C:\Users\kaukau\Anaconda3\lib\site-packages\anaconda_navigator\app\main.py",
  line 22, in 
      from anaconda_navigator.utils.conda import is_conda_available   File
  "C:\Users\kaukau\Anaconda3\lib\site-packages\anaconda_navigator\utils__init__.py",
  line 15, in 
      from qtpy.QtGui import QIcon   File "C:\Users\kaukau\Anaconda3\lib\site-packages\qtpy__init__.py", line
  175, in 
      raise PythonQtError('No Qt bindings could be found') qtpy.PythonQtError: No Qt bindings could be found
C:\Users\kaukau\Desktop>conda install qt --force Traceback (most
  recent call last):   File
  "C:\Users\kaukau\Anaconda3\lib\site-packages\conda\common\configuration.py",
  line 42, in 
      from cytoolz.dicttoolz import merge   File "C:\Users\kaukau\Anaconda3\lib\site-packages\cytoolz__init__.py",
  line 1, in 
      from .itertoolz import * ModuleNotFoundError: No module named 'cytoolz.itertoolz'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):   File
  "C:\Users\kaukau\Anaconda3\lib\site-packages\conda\exceptions.py",
  line 819, in call
      return func(*args, **kwargs)   File "C:\Users\kaukau\Anaconda3\lib\site-packages\conda\cli\main.py", line
  73, in _main
      from ..base.context import context   File "C:\Users\kaukau\Anaconda3\lib\site-packages\conda\base\context.py",
  line 23, in 
      from ..common.configuration import (Configuration, LoadError, MapParameter, PrimitiveParameter,   File
  "C:\Users\kaukau\Anaconda3\lib\site-packages\conda\common\configuration.py",
  line 47, in 
      from .._vendor.toolz.functoolz import excepts   File "C:\Users\kaukau\Anaconda3\lib\site-packages\conda_vendor\toolz\functoolz.py",
  line 501
      f.name for f in reversed((self.first,) + self.funcs),
      ^ SyntaxError: Generator expression must be parenthesized
During handling of the above exception, another exception occurred:
Traceback (most recent call last):   File
  "C:\Users\kaukau\Anaconda3\lib\site-packages\conda\common\configuration.py",
  line 42, in 
      from cytoolz.dicttoolz import merge   File "C:\Users\kaukau\Anaconda3\lib\site-packages\cytoolz__init__.py",
  line 1, in 
      from .itertoolz import * ModuleNotFoundError: No module named 'cytoolz.itertoolz'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):   File
  "C:\Users\kaukau\Anaconda3\Scripts\conda-script.py", line 10, in
  
      sys.exit(main())   File "C:\Users\kaukau\Anaconda3\lib\site-packages\conda\cli\main.py", line
  113, in main
      return conda_exception_handler(_main, *args)   File "C:\Users\kaukau\Anaconda3\lib\site-packages\conda\exceptions.py",
  line 1112, in conda_exception_handler
      return_value = exception_handler(func, *args, **kwargs)   File "C:\Users\kaukau\Anaconda3\lib\site-packages\conda\exceptions.py",
  line 822, in call
      return self.handle_exception(exc_val, exc_tb)   File "C:\Users\kaukau\Anaconda3\lib\site-packages\conda\exceptions.py",
  line 864, in handle_exception
      return self.handle_unexpected_exception(exc_val, exc_tb)   File "C:\Users\kaukau\Anaconda3\lib\site-packages\conda\exceptions.py",
  line 876, in handle_unexpected_exception
      self.print_unexpected_error_report(error_report)   File "C:\Users\kaukau\Anaconda3\lib\site-packages\conda\exceptions.py",
  line 932, in print_unexpected_error_report
      from .base.context import context   File "C:\Users\kaukau\Anaconda3\lib\site-packages\conda\base\context.py",
  line 23, in 
      from ..common.configuration import (Configuration, LoadError, MapParameter, PrimitiveParameter,   File
  "C:\Users\kaukau\Anaconda3\lib\site-packages\conda\common\configuration.py",
  line 47, in 
      from .._vendor.toolz.functoolz import excepts   File "C:\Users\kaukau\Anaconda3\lib\site-packages\conda_vendor\toolz\functoolz.py",
  line 501
      f.name for f in reversed((self.first,) + self.funcs),
      ^ SyntaxError: Generator expression must be parenthesized Traceback (most recent call last):   File
  "C:\Users\kaukau\Anaconda3\lib\site-packages\conda\common\configuration.py",
  line 42, in 
      from cytoolz.dicttoolz import merge   File "C:\Users\kaukau\Anaconda3\lib\site-packages\cytoolz__init__.py",
  line 1, in 
      from .itertoolz import * ModuleNotFoundError: No module named 'cytoolz.itertoolz'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):   File
  "C:\Users\kaukau\Anaconda3\lib\site-packages\conda\cli\main.py", line
  97, in main
      from ..activate import main as activator_main   File "C:\Users\kaukau\Anaconda3\lib\site-packages\conda\activate.py", line
  11, in 
      from .base.context import ROOT_ENV_NAME, context, locate_prefix_by_name   File
  "C:\Users\kaukau\Anaconda3\lib\site-packages\conda\base\context.py",
  line 23, in 
      from ..common.configuration import (Configuration, LoadError, MapParameter, PrimitiveParameter,   File
  "C:\Users\kaukau\Anaconda3\lib\site-packages\conda\common\configuration.py",
  line 47, in 
      from .._vendor.toolz.functoolz import excepts   File "C:\Users\kaukau\Anaconda3\lib\site-packages\conda_vendor\toolz\functoolz.py",
  line 501
      f.name for f in reversed((self.first,) + self.funcs),
      ^ SyntaxError: Generator expression must be parenthesized
During handling of the above exception, another exception occurred:
Traceback (most recent call last):   File
  "C:\Users\kaukau\Anaconda3\lib\site-packages\conda\common\configuration.py",
  line 42, in 
      from cytoolz.dicttoolz import merge   File "C:\Users\kaukau\Anaconda3\lib\site-packages\cytoolz__init__.py",
  line 1, in 
      from .itertoolz import * ModuleNotFoundError: No module named 'cytoolz.itertoolz'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):   File
  "C:\Users\kaukau\Anaconda3\Scripts\conda-script.py", line 10, in
  
      sys.exit(main())   File "C:\Users\kaukau\Anaconda3\lib\site-packages\conda\cli\main.py", line
  110, in main
      return ExceptionHandler().handle_exception(exc_val, exc_tb)   File "C:\Users\kaukau\Anaconda3\lib\site-packages\conda\exceptions.py",
  line 864, in handle_exception
      return self.handle_unexpected_exception(exc_val, exc_tb)   File "C:\Users\kaukau\Anaconda3\lib\site-packages\conda\exceptions.py",
  line 876, in handle_unexpected_exception
      self.print_unexpected_error_report(error_report)   File "C:\Users\kaukau\Anaconda3\lib\site-packages\conda\exceptions.py",
  line 932, in print_unexpected_error_report
      from .base.context import context   File "C:\Users\kaukau\Anaconda3\lib\site-packages\conda\base\context.py",
  line 23, in 
      from ..common.configuration import (Configuration, LoadError, MapParameter, PrimitiveParameter,   File
  "C:\Users\kaukau\Anaconda3\lib\site-packages\conda\common\configuration.py",
  line 47, in 
      from .._vendor.toolz.functoolz import excepts   File "C:\Users\kaukau\Anaconda3\lib\site-packages\conda_vendor\toolz\functoolz.py",
  line 501
      f.name for f in reversed((self.first,) + self.funcs),
      ^ SyntaxError: Generator expression must be parenthesized


I've just found out that I cant even use any conda commands except the : >conda --version< command only.
Please help me resolve this issue without uninstalling then reinstalling anaconda completely