The problem is with the Local Security Policy. I am unable to add a user to "Act as part of the operating system" and "Log on as service" but I have added users to "Back up files and directories".
The "Add Users or Group" button is disabled on "Act as part of the operating system" and "Log on as service".
These to policies have a different icon next to them. 2 computers with a piece of paper in-between them.
I am an admin on the box.
Any suggestions would be appreciated!