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Sometimes computer manufacturers require that you uninstall the current driver first but, sometimes you can just run the driver updates and the update itself will remove the previous version. I recommend getting in contact with Gigabyte so; they can give you the correct procedure to update that driver.
I have successfully installed the driver and now the graphics is back to normal though my monitor is still flickering with double image on and off even with the updated monitor driver and such. Maybe its a monitor or on board graphics problem? Anyway, thanks for your advice.