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You must log in to your computer locally using Administrator rights.
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Make sure that a compatible Oracle server version is installed.
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Set up your client Windows regional and language options as you require. You can only set up these options before the client installation. If you want to change the regional and language options after the installation, you will have to reinstall the Oracle client for the changes to take effect.
After the client installation, you must not change any of the default values of the NLS_LANG parameter on the client.