CF Admin login fails (invalid pw) for Windows User other than the one used to install CF 10

I installed CF 10 on a server running Windows Server 2008 R2 Standard having logged into the server as a Windows user in the administrator group.  I set up CF 10 Administrator to use a single password (the default).  I can log into CF Admin when authenticating to the server with the same Windows credentials used when installing CF 10 but if I log into the server as another Windows user in the administrator group I cannot log into CF Admin; I get an Invalid Password error.  I thought the whole point of the single password was so that anyone who can log into the server could log into CF Admin.  It works like that for my CF 8 and CF 9 machines.