How did you come up with the title to your topic?
Your BIOS won't have any drivers - but there maybe BIOS updates for the Toshiba A305. BIOS updates won't care what version of Windows you're running.
And there also may be driver updates for the Toshiba A305. Driver updates DO care what version of Windows you're running.
I don't suppose you've checked the Toshiba A305 website?