Present but not visible unless it's been invoked and I've never seen that happen in an update.
Is that name definitely spelt with a lower case a? If so, I would be very suspicious of malware
Go to c:\windows\system32 and right click on the file cmd.exe then choose RunAs Administrator.
In the black form that shows up, at the prompt type
net user Administrator /active:no
and hit the Enter key. Close that form and restart the machine then see if it still shows.