I finally solved it on my Win7 computer. I am using UM original after a very long time. I tried newer Cura 2.6 version but could not get same results as using older Cura 14 version.
The error was obvious:
"ImportError: No module named distutils.util"
I already had Python installed. So I copied folder C:\Python27\Lib\distutils to C:\cura14\python\Lib\distutils and now the error is gone.