Please go to conteol pael--->programs ---> uninstall the drivers .If it is needed restart the system and do the whole process.
You need to install the proper drivers. please check the article to install the right one
SAP BW SP08 installed with 64-bit versions of Tableau Desktop or Tableau Server
Uninstall SAP BW SP08, and then install BWODBO64SP02_0-20007320.EXE ( For SAP BW 64-bit 7.30 SP02).
64-bit version of Tableau Desktop
Download and install SAP GUI 7.3 and the correct driver, based on the version of SAP BW 7.3 you are using. Drivers are available from the SAP website. Drive file names correspond to the SAP BW version and service pack, for example:
BWODBO64SP00_0-20007320.EXE ( For SAP BW 64-bit 7.30 SP00)
BWODBO64SP01_0-20007320.EXE ( For SAP BW 64-bit 7.30 SP01)
BWODBO64SP02_0-20007320.EXE ( For SAP BW 64-bit 7.30 SP02)
Install the required SAP BW drivers on the computer running Tableau Server.
If the server is running the 64-bit version of Tableau Server, you must also install the 64-bit SAP BW ODBO driver.
Many thanks Tharashasank Davuluru
I'll be testing and I'll let you know