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When opening ArcMap, the following error message is received on start-up:
"Unable to create or open the default database."
This error is due to one following conditions:
At ArcGIS 10, one of the start-up processes is the creation and/or validation of a default file geodatabase in the <User Profile>\MyDocuments\ArcGIS folder for the user executing the software. The default geodatabase is used in many tasks throughout the application and is required to effectively run the software.
As a result of one of the conditions described in the error message, the default geodatabase cannot be successfully created and/or validated and the start-up of the application fails.
Note: If the folder contains multiple versions of the Default.gdb, skip ahead to Step 6. Multiple default geodatabases have unique names and the follow this naming convention: Default.gdb, Default1.gdb, Default2.gdb, etc. In Windows Explorer, file geodatabases appear as folders with the name of the geodatabase followed by a .gdb extension.