SQL Server ODBC system error code 126

Recently at a site which had Windows Server 2003 R2 64bit SP2, the following error message was received when attempting to create a new SQL Server ODBC data source:

The setup routines for the SQL Server ODBC driver could not be loaded due to system error code 126.

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The resolution in this case was to locate, right click on C:\WINDOWS\inf\mdac.inf and select Install.
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You may need to locate the media to complete the process.
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