Aslam o alikum

meray pass dell Studio 1555 laptop hai masla yeh hai k maine kisi shop wale ko laptop sell keliye diya jb meri us se deal nahin hui to us ne check karte huay mere laptop k bios main password laga liya hai plz help main us ka password kaise remove karsatka hoon bcz mera laptop us k bagair sale nahin hoga plz thanxx