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https://help.tallysolutions.com/docs/te9rel66/Installation/ODBC_driver_could_not_be_loaded_error_code_126.htm

Error code 126: ODBC driver could not be loaded

Cause

When Microsoft Excel is used in a 64-bit computer and Tally.ERP 9 is of 32-bit, the tallywin.dat file fails to communicate with Excel. This results in an error.

Solution

The latest version of Tally.ERP 9 contains the tallywin64.dat file which communicates to all 64-bit Microsoft Office applications. It is recommended that you upgrade to the latest version of Tally.ERP 9.