For both Windows 32-bit and Windows 64-bit, if the setup routines for the Aster ODBC Driver cannot be loaded due to system error 126 when you try to see the Aster ODBC driver to configure it using the ODBC Database Administrator, uninstall and reinstall Teradata SQL Assistant after the ODBC driver installation and try again.
In general, when there are installation problems, all common Teradata ODBC dependent client tools such as ACT and Teradata SQL Assistant should be removed and then reinstalled after the ODBC driver installation.