I've just got a new to me computer and transferred all my files over from my Windows 7 computer.  For some unknown reason when I boot up it's defaulting to using the Admin account which from what I've read should default to not being on.  I've tried running the command prompt to turn it off, but it comes up every time I reboot.  I want my Microsoft account to be the one it defaults to and for the admin account to not even come up, especially as it's not password protected and doesn't seem to want me to add one either.  

Any suggestions as to how to deal with this?  I'm currently preferring my Windows 7, but of course new PC means no choice on this front.  I can't afford to leave it with no password, my ASD teenager would be all over it!