I experienced the same issues with a windows 7 install. It appears
the windows blenderCAM 'out of the box image installations have
issues finding the MS visual c++ dll (msvcp140.dll) and the
Geometric engine dll (geos_c.dll). In addition it appears geos_c.dll
may have some 64bit issue.
The 'out of the box' images; blenderCAM64_0.9.0.zip and blenderCAM32_0.9.0.zip Installed and ran with a 'file not found msvcp140.dll' error on windows 7. When blender comes up there is no CAM tabs. Going to 'file / user preferences / addons' and scrolling through the list shows the CAM add on present.
Once the msvcp140.dll issue was resolved, a similar behavior
showed up with the geos_c.dll not found failure. Once this was
resolved the 64bit image (blenderCAM64_0.9.0.zip)
would issue [WinError 193]
%1 is not a valid Win32 application' on the geos.py geos_c.dll open
and then it would start crashing intermittently. In order to
recover, from the crashing, the geos_c.ddl had to be removed from the
dll search path, the application had to be deleted, the box rebooted
and the app reinstalled.
So after this the 32 bit image (blenderCAM32_0.9.0.zip)
was tried with the two dlls in the dll search path which seemed to
work fine.
So the final 32 bit (blenderCAM32_0.9.0.zip) 'out of the box' install that worked for my windows 7 box is as follows:
Download and extract blender-2.76b-windows32.zip
Copy msvcp140.dll from C:\Windows\SysWOW64\ to c:\Windows\System32\
Copy geos_c.dll from blenderCAM32\blender-2.76\2.76\python\lib\shapely\DLLs to c:\Windows\System32\
The msvcp140.dll is part of the microsoft “Visual C++ Redistributable for Visual Studio 2015” package which can be downloaded at
https://www.microsoft.com/en-us/download/details.aspx?id=48145
I tried installing by component without success. With a Python 3.4.4 install, I also found the standard shapely install failed due to geos.dll. It appears this is by design. The shapely install calls out a separate 'apt-get install libgeos-dev' for Debian and Ubuntu linux, For windows it calls out the following web page of special wheel files with geos.dll; http://www.lfd.uci.edu/~gohlke/pythonlibs/#shapely Interestingly I found the same 64bit peculiarity with the wheel geos.dll files. So I had to stick with the 32bit Shapely-1.5.13-cp34-none-win32.whl
At any rate, I hope this might be of some help
Thanks
Novice