If you have a laptop go to the website of the firm that sells the laptop. Look for your laptop model there.
If you have a Desktop-PC, find out which Mainboard you have installed, then search the mainboard manufacturer's site for a bios update for that mainboard.
if you don't know which mainboard you have, try this link: http://www.computerhope.com/issues/ch000504.htm
Hope that helped.