|It is very unlikely that you have a corrupted BIOS, The BIOS us read only memory and is visually impossible to corrupt unless you did something really silly. More likely you have just been locked out.|
Modern laptops have passwords that cannot be removed by conventional means. This is a security measure as laptops can be so easily stolen. Hardly a day goes by on these forums where someone wants to know how to remove a password on a laptop of doubtful provenance.
The best thing you can do is to contact Acer and see if they can do anything for you. They will almost certainly ask for proof of ownership.