Remove Laptop BIOS password.

[Katheudo]

Or sometimes there is a jumper on certain motherboards that allow you to clear the BIOS password. However I think that might be on desktops only.

[flying_blind]

If you are worried about the warranty then you should contact the manufacturer. If you are the owner of that computer they can actually help you with that issue. Notice also that even if you try CMOS battery removal or other such methods that involve opening the laptop, they might not work.

[hack3rcon]

Some tools are exist for it like :

www.cgsecurity.org/wiki/CmosPwd
https://www.raymond.cc/blog/how-to-reset-remove-clear-or-reveal-cmos-bios-security-password/

but Not worked in Windows 7