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Problem: ArcMap crashes periodically every half hour on Opera Web browsers

Description

When Opera Web browser is installed on a system with ArcGIS this program often interferes with ArcGIS and causes it to systematically crash.

Cause

Opera Web browser is not supported by ArcGIS.

Solution or Workaround

Opera Web browser must be removed by the system.

Warning:
WARNING: The instructions below include making changes to 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. 
 
  1. Close all programs running.
  2. Start > Control Panel > Add/Remove Programs.
  3. Choose Opera Web browser > Remove.
  4. Restart machine and start ArcMap. It should no longer crash.