I went through your instructions without any improvement.  I first uninstalled the program.  Then I reinstalled without the items that you listed the tcl/tk and pip.  The error message still came up just like before.  Then I typed the two programs you gave me into the command prompt.  A message asked me for permission to uninstall the program, which I accepted.  Then I got an error message that said the program only works for products that are already installed.

If I try to open python now, I get the same error message "The program can't start because python35.dll is missing from your computer."