What's the password for Administrator?

On an older version of this I could change my /etc/hosts file by

(1) install vim

(2) 
cd C:\Windows\System32\drivers\etc
runas /no-profile /user:Administrator cmd
Enter the password for Administrator:

(3)
vim hosts

With this new version I can't edit the hosts file (Users IEUser with password Passw0rd! does not write access to that file), and the old Password1 password for Administrator no longer works.