Generally, taking out the CMOS battery (the one fitted to your motherboard) and leaving it out for a couple of minutes, to allow the CMOS power to drain out, will reset your BIOS password to the motherboard manufacturers default.
NOTE: Doing this will set all your BIOS settings to default values!
i would not really do this if you do not have some computer knowledge because u can mess up ur bios if sumthing goes wrong.... i have done it before tho and as long as u kno what to do, go ahead