Windows 7 Enterprise install from CD, would prompt for a Username and the respective System name auto-populated as <username>-PC but it doesn’t prompt you for a password to set for the given username. The default password is <Blank>. One needs to manually reset the password to a certain value for better security practices.
Windows Server 2012: You’ll be asked to set a password for the default built-in administrator account.
Windows Server 2003 R2 SP2: You’ll be asked to set a password for default admin account “Administrator”. It will let you continue the install even if you set a weak or password that doesn’t meet the criteria of strong passwords.