Here's a DOS tip for Windows OS, that will reset (delete) your motherboard's BIOS password (your CMOS password) with no need to open up the computer to remove the battery or disorder with jumpers.
It can come handy when ever lose and forget your BIOS password or if you are working on used computers where the previous owner had BIOS passwords set. It's important annotation here that the password is only the one that stops a user from entering the BIOS setup at boot up, not the one that stops you from going past the process of boot.