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ArcMap unexpectedly exits during the "Loading Document..." stage on startup. No error code is displayed.
This can result from an upgrade to Python 2.7.11, which was released on December 12, 2015.
In the newly released version, there is a line in the code that makes the following statement, where 'PyWin_DLLVersionString' now is "2.7-32".
This statement searches for the registry key HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Python\PythonCore\2.7-32\PythonPath, which does not exist.
With the release of Python 2.7.12, the following procedures are not needed for those that have this version of Python installed. If however it is not possible to upgrade to version 2.7.12, and version 2.7.11 is installed, the three workarounds listed below are still valid options.
Warning: The instructions below include making changes to essential parts of your operating system. It is recommended that you backup your operating system and files, including the registry, before proceeding. Consult with a qualified computer systems professional, if necessary. Esri cannot guarantee results from incorrect modifications while following these instructions; therefore, use caution and proceed at your own risk.Workaround 1