Hi everyone, if you forgot you password for the HD, you could format your HD and recover your OS. But if you forgot your password in your BIOS it is a very simple operation to do but it is against the rules of this site. Better luck next time.
A locked HD can't usually be formatted or anything done to it once it's locked. As for the BIOS password, on modern day laptops it's not a simple operation and is far beyond just taking a battery out of the motherboard or whatever you're thinking.