I am having one of those months.. I was doing some general tidying up on the server when I saw a computer with a name that didn't match the other computer names in the client list. I deleted it and it turns out that it was one of our testing machines, doh! I have added the client computer (student151) back into the list but I am still unable to log in to that PC! Please see the attached file for the exact details.
I am also unable to gain access to the PC locally because I don't have the local login details.. isn't this fun.
I'm sure experts like you guys laugh at newbs like me. lol