Usually you can set a password to access or change the BIOS in the BIOS-setup. But that's specific for the BIOS and the motherboard. So look in your motherboard manual to see the options.
This is kapildev. I have an about on boot menu password. First of all i have a PC with two user accounts. One is Admin and second one is guest user. If someone using my PC in guest account. I don't create Boot Password. I am protecting with these basic New software installation from guest user. If guest wants to install new software Admin password is required. It will be protected. But my question is if Someone Starting My PC and goes directly to boot menu and create new password for boot menu without my knowledge. And he/she shutdown my PC. Then Afterwards when i am starting my PC, It is ask to enter boot Menu password. In this situation what should i do? Me only knows admin password. But He/She created Booting Password. So now i cant use my PC too. Is there any way to protect my PC boot menu with Admin password itself? Because first boot menu comes then user accounts follows. Before i login with my Admin user is any way to protect Boot menu too?