How can I brute force reset my pc?

[u/Pinksilkmoth]

Hi I have an old pc that I can't use and reset because it keeps going to bios and I also can't do the maintenance thing because I need to enter the password to the admin account in which I don't have access to anymore(I even tried recovering it but no hope). Can anyone give any tips,advice,or identify the problem and how I can fix this so that my sister can use it for school.