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Attempting to start ArcMap or ArcCatalog results in the following error:
"Microsoft Visual C++ Runtime Library - Runtime Error! Program: C:\arcgis\arcexe81\bin\ArcMap.exe abnormal program termination"
This error can be caused by unregistered files on all Windows platforms, or an incorrect version of Comcat.dll on Windows NT only.
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.
Note: Copy the register_arcinfo8.bat to C:\WINNT\System32 to run it there.