To reset BIOS there are 3 methods you can use:
1) (This is probably not available to you as you're locked out due to the password) Go to BIOS and look for 'reset to default' or something similar, usually on the last tab or when you click exit.
2) You can also reset by using the CLEAR CMOS jumper on the motherboard. Refer to your m/b manual for specifics but generally, look for pins labelled CMOS CLR and move the jumper over the two pins that currently aren't covered by the jumper--- your manual will help you.
3) You can also reset BIOS by removing the CMOS battery. Just remove the battery, then press the power button on your case to drain remaining charge, wait 2-3 minutes then reinsert battery. This should reset BIOS.