Windows drivers are not the same as bios files. When you update your mobo with the latest bios, that includes the bios for the integrated IDE controllers. However, if you have additional controllers (whether integrated on the mobo or not) -- for example, Promise, or Highpoint controllers -- then you need to download the latest bios updates for those controllers individually, they are not part of the mobo bios.
You can get the latest bios for such 3rd party controllers from the manufacturer's website or from your mobo manufacturer website. If needed (for example with the Promise controllers), make sure you update the windows drivers before updating the bios files on the controller or you won't be able to boot anymore.