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When starting the installation of ArcGIS, the installer returns the following error:
Error: "Installation Aborted Internal Error"
The environment variables TEMP and TMP are pointing to a directory inaccessible to the user.
Change the values for the TEMP and TMP variables. The value should contain a directory to which the user has permission to write files.
For help with setting a system environment variable, see: How To: Edit an environment variable.