You cannot change a Windows password ***** BIOS Setup, of course.
Do you have the Power-On password, please?
If so... you should have control over disabling the BIOS Setup setting that enables the power-On password ***** the first place. Or at least power to change it to a 0-length password ***** will only require a RETURN key press after power-On.
If you do not follow the procedure appropriate for your BIOS Setup type/version, though, the change will not take.
E.g.: if you are required to enter first the current password ***** power-On, then the new password ***** want to change it to, then this has to be done exactly right or it will be refused.
E.g.: it may be in some BIOS Setups, you cannot disable the power-On password ***** one is set.
As for the Windows password... the chips on the laptop will never do anything about that. It is essentially on the hard disk, in the software.