Problem installing Mayavi 4.5 in a 64-bit Anaconda3 distribution over Windows 8.1

I have a problem installing Mayavi 4.5 on the 64-bit version of Anaconda3 (in the 32-bit it does not give a single problem). After installing Anaconda3, by:

conda install -c menpo mayavi=4.5.0

I install Mayavi. Everything seems to work well until at the time of linking the packages:

Linking packages ...
An unexpected error has occurred, please consider sending the            |   0%
following traceback to the conda GitHub issue tracker at:

    https://github.com/conda/conda/issues

Include the output of the command 'conda info' in your report.

Traceback (most recent call last):
  File "C:\Users\flop\Anaconda3\Scripts\conda-script.py", line 5, in <module>
    sys.exit(main())
  File "C:\Users\flop\Anaconda3\lib\site-packages\conda\cli\main.py", line 120,
in main
    exit_code = args_func(args, p)
  File "C:\Users\flop\Anaconda3\lib\site-packages\conda\cli\main.py", line 130,
in args_func
    exit_code = args.func(args, p)
  File "C:\Users\flop\Anaconda3\lib\site-packages\conda\cli\main_install.py", li
ne 78, in execute
    install(args, parser, 'install')
  File "C:\Users\flop\Anaconda3\lib\site-packages\conda\cli\install.py", line 40
7, in install
    execute_actions(actions, index, verbose=not args.quiet)
  File "C:\Users\flop\Anaconda3\lib\site-packages\conda\plan.py", line 599, in e
xecute_actions
    inst.execute_instructions(plan, index, verbose)
  File "C:\Users\flop\Anaconda3\lib\site-packages\conda\instructions.py", line 1
35, in execute_instructions
    cmd(state, arg)
  File "C:\Users\flop\Anaconda3\lib\site-packages\conda\instructions.py", line 7
8, in LINK_CMD
    link(state['prefix'], dist, lt, index=state['index'])
  File "C:\Users\flop\Anaconda3\lib\site-packages\conda\install.py", line 1092,
in link
    if not run_script(prefix, dist, 'post-link'):
  File "C:\Users\flop\Anaconda3\lib\site-packages\conda\install.py", line 550, i
n run_script
    subprocess.check_call(args, env=env)
  File "C:\Users\flop\Anaconda3\lib\subprocess.py", line 576, in check_call
    retcode = call(*popenargs, **kwargs)
  File "C:\Users\flop\Anaconda3\lib\subprocess.py", line 557, in call
    with Popen(*popenargs, **kwargs) as p:
  File "C:\Users\flop\Anaconda3\lib\subprocess.py", line 947, in __init__
    restore_signals, start_new_session)
  File "C:\Users\flop\Anaconda3\lib\subprocess.py", line 1224, in _execute_child
    startupinfo)
FileNotFoundError: [WinError 2] El sistema no puede encontrar el archivo especificado

Even if I want to create a virtual environment to install Mayavi 4.5 later, after creating it and trying to activate it, I get the following error:

C:\Users\flop\Anaconda3\Scripts>activate mientorno
".COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.MSC" no se reconoce como un comando interno o externo,
programa o archivo por lotes ejecutable.

I would appreciate any suggestions. Thank you very much.