Question Windows 8.1 how to get UAC Password?

[mikehende]

Hey guys, in this win8.1 the owner doesn;t have a password to log into windows desktop after powering on but when I try now to install a software it is asking for a password. He had said he thinks it has some sort of a password but can't remember it. Anything i can do to try and get whatever password the UAC is asking for please?

 

[ultimatebob]

For UAC, it probably wants the Administrator password. Can you reset it if you do not know it?

 

[mikehende]

The owner got back to me with the correct password, thanks but for future knowledge, is there anything works 100% to get into windows from power on if password is forgotten?