Run as service password

Run as service password

When trying to run as a service, the box for credentials pops up, but it will not take local admin credentials. 

I put in the local admin username and password and it does not elevate the session.  It just says incorrect username/password.  I have had this problem on both Windows 7 and Windows 8.1 machines.  I know the credentials are correct because when I go on site and log in, the credentials work properly.