Import Error: No module named 'tables'

[snippsat]

'pip3' is not recognized as an internal or external command,

Here without setting environment Variables Path,which i will show later.
From cmd cd into in C:\Python34\Scripts

Output:
C:\Windows\System32>cd\
C:\>cd python34\scripts
C:\Python34\Scripts>

First update pip.

Output:
C:\Python34\Scripts>pip install --upgrade pip
Requirement already up-to-date: pip in c:\python34\lib\site-packages

All wheel you download place them in C:\Python34\Scripts folder.
First install from gohlke Numexrp
Eg for 32-bit python pip install numexpr-2.6.1-cp34-cp34m-win32.whl

Now download from Pytables,you need wheel or a complier is needed(Pytables has C extension).
Eg for 32-bit python pip install tables-3.3.0-cp34-cp34m-win32.whl

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Set up environment Variables Path so pip and python command work from anywhere in cmd.
Watch this Video
You do the same but to Path you add: ;C:\python34\;C:\python34\scripts
Restart and test pip/python from anywhere in cmd.