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Hi Arun and warm wishes to you also!
I believe that this article might offer a solution: Error "The drivers...are not properly installed" Connecting to SAP BW | Tableau Software
The article states the resolution (for 64-bit versions of Tableau Desktop or Tableau Server) to be "Uninstall SAP BW SP08, and then install BWODBO64SP02_0-20007320.EXE ( For SAP BW 64-bit 7.30 SP02)."
Hope this helps you!