Hi, The Win 10 rescue disc has two options to reinstall Win 10...Just 
Remove My Files and Fully Clean the Drive. I do not know the password. 
Will either or both of these allow me to enter a new password?  Thanks, 
I am helping a friend who is trying to use his deceased son's HP 
laptop.  Stanford  PS. l had a thumbdrive with the Win 10 install on it 
but it is at least temporarily misplaced. I have read that the Win 10 
password can not be bypassed, that Win 10 must be re-installed.