I'm trying to get a scheduled task to run on Windows Server 2008. It has been working fine for months, and then hung, so I killed it, and now I can't get it to start. (In case it's not obvious, I'm not a Windows sysadmin by any stretch of the imagination. I inherited responsibility for this system, more or less.)

The error it gives is: "The user account does not have permission to run this task". The task's "author" is "A". The task's "When running the task, use the following user account:" is "B". And my user is "C". All of A, B, C are members of the Administrators group, so I'm a bit puzzled as to why it thinks I don't have permissions to run this.

Ideas?