If, in fact, the BIOS is locked, you will never be able to use that computer, even if you try to reinstall Windows. There is nothing that anyone can do to help you, other than the person - or more likely, the organization - who locked it in the first place. You would have to replace the motherboard, but that will probably cost you more than you paid for the computer.
Still, it's not a total loss: You might be able to harvest some good hardware, like a graphics card or power supply or cooling fans, that you can use in your next project.